diff --git a/libavcodec/golomb.h b/libavcodec/golomb.h
index 695609f6c7..989a87a88e 100644
--- a/libavcodec/golomb.h
+++ b/libavcodec/golomb.h
@@ -75,7 +75,8 @@ static inline int get_ue_golomb(GetBitContext *gb){
 }
 
  /**
- * read unsigned exp golomb code, constraint to a max of 31
+ * read unsigned exp golomb code, constraint to a max of 31.
+ * the return value is undefined if the stored value exceeds 31.
  */
 static inline int get_ue_golomb_31(GetBitContext *gb){
     unsigned int buf;