diff --git a/doc/software-manual.tex b/doc/software-manual.tex
index cb20c45ca463d9d23561641a331be87aca46f54d..67efaa3c4dd6dd4148c64835458c1483289a251c 100644
--- a/doc/software-manual.tex
+++ b/doc/software-manual.tex
@@ -5943,6 +5943,18 @@ Specifies sii_num_units_in_shutter_interval for single entry.If multiple entries
   \Default{0} &
   Specifies the bottom offset of spatial extrapolation for the \emph{i}-th neural network post-filter.
   \\
+  \Option{SEINNPFCAapplicationPurposeTagUriPresentFlag\emph{i}} &
+  \Default{false} &
+  Specifies the nnpfc_application_purpose_tag_uri_present_flag syntax element for the \emph{i}-th neural network post-filter.
+  \par
+    When true (non-zero) specifies the presence of the nnpfc_application_purpose_tag_uri syntax element in the NNPFC SEI message.
+  \par
+    When false specifies the absence of the nnpfc_application_purpose_tag_uri syntax element in the NNPFC SEI message.
+  \\
+  \Option{SEINNPFCApplicationPurposeTagUri\emph{i}} &
+  \Default{""} &
+  specifies a tag URI with syntax and semantics as specified in IETF RFC 4151 identifying the application determined purpose of the NNPF, when nnpfc_purpose is equal to 0 of the \emph{i}-th neural network post-filter.
+  \\
   \Option{SEINNPFCInputPicOutputFlag\emph{i}} &
   \Default{false} &
   Indicates whether the i-th neural network post filter generates a corresponding output picture for the i-th input picture. 
diff --git a/source/App/EncoderApp/EncApp.cpp b/source/App/EncoderApp/EncApp.cpp
index 2c0af94e3b55a80bd89154f7edd239144ecce27b..d6a1911635732271141be1a3e944852d344b6e11 100644
--- a/source/App/EncoderApp/EncApp.cpp
+++ b/source/App/EncoderApp/EncApp.cpp
@@ -1293,6 +1293,13 @@ void EncApp::xInitLibCfg( int layerIdx )
         m_cEncLib.setNNPostFilterSEICharacteristicsSpatialExtrapolationRightOffset (m_nnPostFilterSEICharacteristicsSpatialExtrapolationRightOffset[i], i);
         m_cEncLib.setNNPostFilterSEICharacteristicsSpatialExtrapolationTopOffset   (m_nnPostFilterSEICharacteristicsSpatialExtrapolationTopOffset[i], i);
         m_cEncLib.setNNPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset(m_nnPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset[i], i);
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+      m_cEncLib.setNNPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag( m_nnPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag[i], i);
+      if (m_cEncLib.getNNPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag(i))
+      {
+        m_cEncLib.setNNPostFilterSEICharacteristicsSpatialExrapolationPrompt( m_nnPostFilterSEICharacteristicsSpatialExtrapolationPrompt[i], i);
+      }
+#endif
       }
 #endif
       m_cEncLib.setNNPostFilterSEICharacteristicsAbsentInputPicZeroFlag  (m_nnPostFilterSEICharacteristicsAbsentInputPicZeroFlag[i], i);
diff --git a/source/App/EncoderApp/EncAppCfg.cpp b/source/App/EncoderApp/EncAppCfg.cpp
index a5402d7bbac73a5cb4d959c00246547849eca9c9..7d7358608c759a876d8d30d478d962b903815fe1 100644
--- a/source/App/EncoderApp/EncAppCfg.cpp
+++ b/source/App/EncoderApp/EncAppCfg.cpp
@@ -2091,6 +2091,14 @@ bool EncAppCfg::parseCfg( int argc, char* argv[] )
     std::ostringstream spatialExtrapolationBottomOffset;
     spatialExtrapolationBottomOffset << "SEINNPFCSpatialExtrapolationLeftOffset" << i; 
     opts.addOptions()(spatialExtrapolationBottomOffset.str(), m_nnPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset[i], 0, "Bottom offset of spatial extrapolation");
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+    std::ostringstream spatialextrapolationPromptPresentFlag;
+    spatialextrapolationPromptPresentFlag << "SEINNPFCSpatialExtrapolationPromptPresentFlag" << i;
+    opts.addOptions()(spatialextrapolationPromptPresentFlag.str(), m_nnPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag[i], false, "equal to 1 specifies that nnpfc_prompt syntax element is present and nnpfc_alignment_zero_bit_c syntax element may be present. nnpfc_spatial_extrapolation_prompt_present_flag equal to 0 specifies that nnpfc_prompt syntax element and nnpfc_alignment_zero_bit_c syntax element are not present.");
+    std::ostringstream spatialextrapolationPrompt;
+    spatialextrapolationPrompt << "SEINNPFCSpatialExtrapolationPrompt" << i;
+    opts.addOptions()(spatialextrapolationPrompt.str(), m_nnPostFilterSEICharacteristicsSpatialExtrapolationPrompt[i], std::string(""), "specifies the text string prompt used for generating the contents of the spatial extrapolation image area.");
+#endif
 #endif
     std::ostringstream InputPicOutputFlag;
     InputPicOutputFlag << "SEINNPFCInputPicOutputFlag" << i;
diff --git a/source/App/EncoderApp/EncAppCfg.h b/source/App/EncoderApp/EncAppCfg.h
index 2b58fcea3abf2370a635d7d5341790d43b8008a4..850a8bb957e19f6cd990f14dd34a2639040ca467 100644
--- a/source/App/EncoderApp/EncAppCfg.h
+++ b/source/App/EncoderApp/EncAppCfg.h
@@ -841,6 +841,10 @@ protected:
   int32_t               m_nnPostFilterSEICharacteristicsSpatialExtrapolationRightOffset[MAX_NUM_NN_POST_FILTERS];
   int32_t               m_nnPostFilterSEICharacteristicsSpatialExtrapolationTopOffset[MAX_NUM_NN_POST_FILTERS];
   int32_t               m_nnPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset[MAX_NUM_NN_POST_FILTERS];
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+  bool                  m_nnPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag[MAX_NUM_NN_POST_FILTERS];
+  std::string           m_nnPostFilterSEICharacteristicsSpatialExtrapolationPrompt[MAX_NUM_NN_POST_FILTERS];
+#endif
 #endif
   std::vector<bool>     m_nnPostFilterSEICharacteristicsInputPicOutputFlag[MAX_NUM_NN_POST_FILTERS];
   bool                  m_nnPostFilterSEICharacteristicsAbsentInputPicZeroFlag[MAX_NUM_NN_POST_FILTERS];
diff --git a/source/Lib/CommonLib/SEI.cpp b/source/Lib/CommonLib/SEI.cpp
index 4e9de5d13f85992ee27e246238546b5a54d8a2fd..ebff938ae6fda6ae9aa88ccfd8d964605cc2d07c 100644
--- a/source/Lib/CommonLib/SEI.cpp
+++ b/source/Lib/CommonLib/SEI.cpp
@@ -1020,6 +1020,10 @@ SEINeuralNetworkPostFilterCharacteristics::SEINeuralNetworkPostFilterCharacteris
   m_spatialExtrapolationRightOffset = sei.m_spatialExtrapolationRightOffset;
   m_spatialExtrapolationTopOffset = sei.m_spatialExtrapolationTopOffset;
   m_spatialExtrapolationBottomOffset = sei.m_spatialExtrapolationBottomOffset;
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+  m_spatialExtrapolationPromptPresentFlag = sei.m_spatialExtrapolationPromptPresentFlag;
+  m_prompt =  sei.m_prompt;
+#endif
 #endif
   m_inputPicOutputFlag = sei.m_inputPicOutputFlag;
 }
@@ -1088,6 +1092,10 @@ bool SEINeuralNetworkPostFilterCharacteristics::operator == (const SEINeuralNetw
   m_spatialExtrapolationRightOffset == sei.m_spatialExtrapolationRightOffset &&
   m_spatialExtrapolationTopOffset == sei.m_spatialExtrapolationTopOffset &&
   m_spatialExtrapolationBottomOffset == sei.m_spatialExtrapolationBottomOffset &&
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+  m_spatialExtrapolationPromptPresentFlag == sei.m_spatialExtrapolationPromptPresentFlag  &&
+  m_prompt ==  sei.m_prompt  &&
+#endif
 #endif
   m_inputPicOutputFlag == sei.m_inputPicOutputFlag &&
   m_payloadLength == sei.m_payloadLength;
diff --git a/source/Lib/CommonLib/SEI.h b/source/Lib/CommonLib/SEI.h
index 7486df67b20c6375968f28678befaff58cd4e543..f7e4fab5c6fd2bb2319793d32c32987670378ad5 100644
--- a/source/Lib/CommonLib/SEI.h
+++ b/source/Lib/CommonLib/SEI.h
@@ -1438,6 +1438,10 @@ public:
     , m_spatialExtrapolationRightOffset(0)
     , m_spatialExtrapolationTopOffset(0)
     , m_spatialExtrapolationBottomOffset(0)
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+    , m_spatialExtrapolationPromptPresentFlag(false)
+    , m_prompt("")
+#endif
 #endif
     , m_absentInputPicZeroFlag(false)
     , m_numInpPicsInOutputTensor(0)
@@ -1525,6 +1529,10 @@ public:
   int32_t        m_spatialExtrapolationRightOffset;
   int32_t        m_spatialExtrapolationTopOffset;
   int32_t        m_spatialExtrapolationBottomOffset;
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+  bool          m_spatialExtrapolationPromptPresentFlag;
+  std::string   m_prompt;
+#endif
 #endif
   std::vector<bool> m_inputPicOutputFlag;
   bool           m_absentInputPicZeroFlag;
diff --git a/source/Lib/CommonLib/TypeDef.h b/source/Lib/CommonLib/TypeDef.h
index 0de9dfe13daf00b48b66c94ce2693ff5a0c62bb0..a38268d918b283c4a22aaf881222b30675f7dab9 100644
--- a/source/Lib/CommonLib/TypeDef.h
+++ b/source/Lib/CommonLib/TypeDef.h
@@ -70,6 +70,8 @@
 
 #define JVET_AI0153_OMI_SEI 1 // JVET-AI0153: OMI-SEI Implementation as JVET-AH0346
 
+#define JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1  1 //JVET-AI0061 proposal 1: signal a NNPFC prompt for spatial extrapolation
+
 #define JVET_AI0061_PROPOSAL2_SPATIAL_EXTRAPOLATION 1 // JVET AI0061-Proposal2: Ensure spatial extrapolation works correctly (Option 1)
 
 //########### place macros to be be kept below this line ###############
diff --git a/source/Lib/DecoderLib/SEIread.cpp b/source/Lib/DecoderLib/SEIread.cpp
index c3d118e200aa20fe3b29cc64ee0ac9e5d09ac417..4ba50666278182d0ab3c8e5d272a0e4ae91b6c78 100644
--- a/source/Lib/DecoderLib/SEIread.cpp
+++ b/source/Lib/DecoderLib/SEIread.cpp
@@ -3225,6 +3225,21 @@ void SEIReader::xParseSEINNPostFilterCharacteristics(SEINeuralNetworkPostFilterC
       sei.m_spatialExtrapolationTopOffset = value;
       sei_read_svlc(pDecodedMessageOutputStream, value, "nnpfc_spatial_extrapolation_bottom_offset");
       sei.m_spatialExtrapolationBottomOffset = value;
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+      sei_read_flag(pDecodedMessageOutputStream, val, "nnpfc_spatial_extrapolation_prompt_present_flag");
+      sei.m_spatialExtrapolationPromptPresentFlag = val;
+      if (sei.m_spatialExtrapolationPromptPresentFlag)
+      {
+        std::string valp;
+        while (!isByteAligned())
+        {
+          sei_read_flag(pDecodedMessageOutputStream, val, "nnpfc_alignment_zero_bit_c");
+          CHECK(val != 0, "nnpfc_alignment_zero_bit_c not equal to zero");
+        }
+        sei_read_string(pDecodedMessageOutputStream, valp, "nnpfc_prompt");
+        sei.m_prompt = valp;
+      }
+#endif
     }
 #endif
 
diff --git a/source/Lib/EncoderLib/EncCfg.h b/source/Lib/EncoderLib/EncCfg.h
index f0ea7cad9f2d1e3998ba934cf07efbf30bda4cfe..4efc9342e74a99c7fb3420efb00cc3f4e2e14db4 100644
--- a/source/Lib/EncoderLib/EncCfg.h
+++ b/source/Lib/EncoderLib/EncCfg.h
@@ -778,6 +778,10 @@ protected:
   int32_t                 m_nnPostFilterSEICharacteristicsSpatialExtrapolationRightOffset[MAX_NUM_NN_POST_FILTERS];
   int32_t                 m_nnPostFilterSEICharacteristicsSpatialExtrapolationTopOffset[MAX_NUM_NN_POST_FILTERS];
   int32_t                 m_nnPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset[MAX_NUM_NN_POST_FILTERS];
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+  bool                    m_nnPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag[MAX_NUM_NN_POST_FILTERS];
+  std::string             m_nnPostFilterSEICharacteristicsSpatialExtrapolationPrompt[MAX_NUM_NN_POST_FILTERS];
+#endif
 #endif
   std::vector<bool>       m_nnPostFilterSEICharacteristicsInputPicOutputFlag[MAX_NUM_NN_POST_FILTERS];
   bool                    m_nnPostFilterSEICharacteristicsAbsentInputPicZeroFlag[MAX_NUM_NN_POST_FILTERS];
@@ -2197,6 +2201,12 @@ public:
   int32_t     getNNPostFilterSEICharacteristicsSpatialExtrapolationTopOffset(int filterIdx)                             { return m_nnPostFilterSEICharacteristicsSpatialExtrapolationTopOffset[filterIdx]; }
   void        setNNPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset(int32_t value, int filterIdx)           { m_nnPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset[filterIdx] = value; }
   int32_t     getNNPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset(int filterIdx)                          { return m_nnPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset[filterIdx]; }
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+  void        setNNPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag(bool promptPresentFlag, int filterIdx) { m_nnPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag[filterIdx] = promptPresentFlag; }
+  bool        getNNPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag(int filterIdx) const                   { return m_nnPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag[filterIdx]; }
+  void        setNNPostFilterSEICharacteristicsSpatialExrapolationPrompt(std::string prompt, int filterIdx)                 { m_nnPostFilterSEICharacteristicsSpatialExtrapolationPrompt[filterIdx] = prompt; }
+  std::string getNNPostFilterSEICharacteristicsSpatialExrapolationPrompt(int filterIdx) const                               { return m_nnPostFilterSEICharacteristicsSpatialExtrapolationPrompt[filterIdx]; }
+#endif
 #endif
   void        setNNPostFilterSEICharacteristicsInputPicOutputFlag(std::vector<bool> value, int filterIdx)   { m_nnPostFilterSEICharacteristicsInputPicOutputFlag[filterIdx] = value; }
   const       std::vector<bool>& getNNPostFilterSEICharacteristicsInputPicOutputFlag(int filterIdx)         { return m_nnPostFilterSEICharacteristicsInputPicOutputFlag[filterIdx]; }
diff --git a/source/Lib/EncoderLib/SEIEncoder.cpp b/source/Lib/EncoderLib/SEIEncoder.cpp
index 42689af050b955164033bb0e2426463a34022e1f..6d769158f10aa146fd1002d2c48152126222ff20 100644
--- a/source/Lib/EncoderLib/SEIEncoder.cpp
+++ b/source/Lib/EncoderLib/SEIEncoder.cpp
@@ -1662,6 +1662,13 @@ void SEIEncoder::initSEINeuralNetworkPostFilterCharacteristics(SEINeuralNetworkP
       sei->m_spatialExtrapolationRightOffset = m_pcCfg->getNNPostFilterSEICharacteristicsSpatialExtrapolationRightOffset(filterIdx);
       sei->m_spatialExtrapolationTopOffset = m_pcCfg->getNNPostFilterSEICharacteristicsSpatialExtrapolationTopOffset(filterIdx);
       sei->m_spatialExtrapolationBottomOffset = m_pcCfg->getNNPostFilterSEICharacteristicsSpatialExtrapolationBottomOffset(filterIdx);
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+      sei->m_spatialExtrapolationPromptPresentFlag = m_pcCfg->getNNPostFilterSEICharacteristicsSpatialExtrapolationPromptPresentFlag(filterIdx);
+      if (sei->m_spatialExtrapolationPromptPresentFlag)
+      {
+        sei->m_prompt = m_pcCfg->getNNPostFilterSEICharacteristicsSpatialExrapolationPrompt(filterIdx);
+      }
+#endif
     }
 #endif
 
diff --git a/source/Lib/EncoderLib/SEIwrite.cpp b/source/Lib/EncoderLib/SEIwrite.cpp
index 5ccaf963d78fecc047461c5b0b7c330355d2fb4e..762cecda07cf44f9092b02e82f6cc77baa091396 100644
--- a/source/Lib/EncoderLib/SEIwrite.cpp
+++ b/source/Lib/EncoderLib/SEIwrite.cpp
@@ -1938,6 +1938,17 @@ void SEIWriter::xWriteSEINeuralNetworkPostFilterCharacteristics(const SEINeuralN
       xWriteSvlc(sei.m_spatialExtrapolationRightOffset, "nnpfc_spatial_extrapolation_right_offset");
       xWriteSvlc(sei.m_spatialExtrapolationTopOffset, "nnpfc_spatial_extrapolation_top_offset");
       xWriteSvlc(sei.m_spatialExtrapolationBottomOffset, "nnpfc_spatial_extrapolation_right_offset");
+#if JVET_AI0061_SPATIAL_EXTRAPOLATION_PROPOSAL1
+      xWriteFlag(sei.m_spatialExtrapolationPromptPresentFlag, "nnpfc_spatial_extrapolation_prompt_present_flag");
+      if (sei.m_spatialExtrapolationPromptPresentFlag)
+      {
+        while (!isByteAligned())
+        {
+          xWriteFlag(0, "nnpfc_alignment_zero_bit_c");
+        }
+        xWriteString(sei.m_prompt, "nnpfc_prompt");
+      }
+#endif
     }
 #endif