diff --git a/libs/ultrahdr/include/ultrahdr/jpegrutils.h b/libs/ultrahdr/include/ultrahdr/jpegrutils.h
index ed38e07..4ab664e 100644
--- a/libs/ultrahdr/include/ultrahdr/jpegrutils.h
+++ b/libs/ultrahdr/include/ultrahdr/jpegrutils.h
@@ -102,7 +102,9 @@
  *     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  *     <rdf:Description
  *       xmlns:Container="http://ns.google.com/photos/1.0/container/"
- *       xmlns:Item="http://ns.google.com/photos/1.0/container/item/">
+ *       xmlns:Item="http://ns.google.com/photos/1.0/container/item/"
+ *       xmlns:hdrgm="http://ns.adobe.com/hdr-gain-map/1.0/"
+ *       hdrgm:Version="1">
  *       <Container:Directory>
  *         <rdf:Seq>
  *           <rdf:li
@@ -127,7 +129,8 @@
  * @param secondary_image_length length of secondary image
  * @return XMP metadata in type of string
  */
-std::string generateXmpForPrimaryImage(int secondary_image_length);
+std::string generateXmpForPrimaryImage(int secondary_image_length,
+                                       ultrahdr_metadata_struct& metadata);
 
 /*
  * This method generates XMP metadata for the recovery map image.
diff --git a/libs/ultrahdr/include/ultrahdr/ultrahdr.h b/libs/ultrahdr/include/ultrahdr/ultrahdr.h
index 302aeee..f970936 100644
--- a/libs/ultrahdr/include/ultrahdr/ultrahdr.h
+++ b/libs/ultrahdr/include/ultrahdr/ultrahdr.h
@@ -48,7 +48,7 @@
  */
 struct ultrahdr_metadata_struct {
   // Ultra HDR library version
-  uint32_t version;
+  const char* version;
   // Max Content Boost for the map
   float maxContentBoost;
   // Min Content Boost for the map
@@ -58,4 +58,4 @@
 
 }  // namespace android::ultrahdr
 
-#endif //ANDROID_ULTRAHDR_ULTRAHDR_H
\ No newline at end of file
+#endif //ANDROID_ULTRAHDR_ULTRAHDR_H
diff --git a/libs/ultrahdr/jpegr.cpp b/libs/ultrahdr/jpegr.cpp
index 5f55d1b..0f7aa27 100644
--- a/libs/ultrahdr/jpegr.cpp
+++ b/libs/ultrahdr/jpegr.cpp
@@ -61,7 +61,7 @@
   }
 
 // The current JPEGR version that we encode to
-static const uint32_t kJpegrVersion = 1;
+static const char* const kJpegrVersion = "1.0";
 
 // Map is quarter res / sixteenth size
 static const size_t kMapDimensionScaleFactor = 4;
@@ -943,7 +943,7 @@
                                  + xmp_secondary_length
                                  + compressed_gain_map->length;
   // primary image
-  const string xmp_primary = generateXmpForPrimaryImage(secondary_image_size);
+  const string xmp_primary = generateXmpForPrimaryImage(secondary_image_size, *metadata);
   // same as primary
   const int xmp_primary_length = 2 + nameSpaceLength + xmp_primary.size();
 
diff --git a/libs/ultrahdr/jpegrutils.cpp b/libs/ultrahdr/jpegrutils.cpp
index 9d07a6f..6430af1 100644
--- a/libs/ultrahdr/jpegrutils.cpp
+++ b/libs/ultrahdr/jpegrutils.cpp
@@ -302,7 +302,7 @@
     return true;
 }
 
-string generateXmpForPrimaryImage(int secondary_image_length) {
+string generateXmpForPrimaryImage(int secondary_image_length, ultrahdr_metadata_struct& metadata) {
   const vector<string> kConDirSeq({kConDirectory, string("rdf:Seq")});
   const vector<string> kLiItem({string("rdf:li"), kConItem});
 
@@ -316,6 +316,8 @@
   writer.StartWritingElement("rdf:Description");
   writer.WriteXmlns(kContainerPrefix, kContainerUri);
   writer.WriteXmlns(kItemPrefix, kItemUri);
+  writer.WriteXmlns(kGainMapPrefix, kGainMapUri);
+  writer.WriteAttributeNameAndValue(kMapVersion, metadata.version);
 
   writer.StartWritingElements(kConDirSeq);
 
diff --git a/libs/ultrahdr/tests/jpegr_test.cpp b/libs/ultrahdr/tests/jpegr_test.cpp
index ba3b4d0..58cd8f4 100644
--- a/libs/ultrahdr/tests/jpegr_test.cpp
+++ b/libs/ultrahdr/tests/jpegr_test.cpp
@@ -180,6 +180,7 @@
 
 TEST_F(JpegRTest, writeXmpThenRead) {
   ultrahdr_metadata_struct metadata_expected;
+  metadata_expected.version = "1.0";
   metadata_expected.maxContentBoost = 1.25;
   metadata_expected.minContentBoost = 0.75;
   const std::string nameSpace = "http://ns.adobe.com/xap/1.0/\0";
@@ -538,7 +539,7 @@
 
   JpegRBenchmark benchmark;
 
-  ultrahdr_metadata_struct metadata = { .version = 1,
+  ultrahdr_metadata_struct metadata = { .version = "1.0",
                               .maxContentBoost = 8.0f,
                               .minContentBoost = 1.0f / 8.0f };