diff --git a/starboard/CHANGELOG.md b/starboard/CHANGELOG.md
index 32992c28baa2..afc54a3fe70d 100644
--- a/starboard/CHANGELOG.md
+++ b/starboard/CHANGELOG.md
@@ -36,6 +36,10 @@ deprecated.
 The APIs defined in `starboard/image.h` are no longer used and have been
 deprecated.
 
+### Add a new enum `kIamfConfigObus` to `SbPlayerSampleSideDataType` in `starboard/player.h`
+This value allows IAMF samples to be written to Starboard along with IAMF
+Config OBUs as side data.
+
 ## Version 15
 
 ### SbMemoryReporter is no longer used
diff --git a/starboard/player.h b/starboard/player.h
index abf17a6980ad..0d3c85a4a41c 100644
--- a/starboard/player.h
+++ b/starboard/player.h
@@ -145,6 +145,12 @@ typedef enum SbPlayerSampleSideDataType {
   // The first 8 bytes of the data contains the value of BlockAddID in big
   // endian format, followed by the content of BlockAdditional.
   kMatroskaBlockAdditional,
+#if SB_API_VERSION >= 16
+  // The config OBUs located in the IASampleEntry Box in the MP4 container, as
+  // specified in
+  // https://aomediacodec.github.io/iamf/#standalone-descriptor-obus.
+  kIamfConfigObus,
+#endif  // SB_API_VERSION >= 16
 } SbPlayerSampleSideDataType;
 
 // Side data accompanied with |SbPlayerSampleInfo|, it can be arbitrary binary