diff --git a/platform-independent/c/core/src/mpw-marshal.h b/platform-independent/c/core/src/mpw-marshal.h
index cc30ea58..8c6a088a 100644
--- a/platform-independent/c/core/src/mpw-marshal.h
+++ b/platform-independent/c/core/src/mpw-marshal.h
@@ -169,7 +169,8 @@ const MPMarshalFormat mpw_format_named(
 const char *mpw_format_name(
         const MPMarshalFormat format);
 /**
- * @return The file extension (static) that's recommended for files that use the given marshalling format or NULL if the format was not recognized.
+ * @return The file extension (static) that's recommended and currently used for output files,
+ *         or NULL if the format was not recognized or does not support marshalling.
  */
 const char *mpw_marshal_format_extension(
         const MPMarshalFormat format);