diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index fb0c5c288b..4f4ce5bbbd 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -946,7 +946,7 @@ static void vc1_mc_4mv_chroma(VC1Context *v, int dir)
     }
 }
 
-/** Do motion compensation for 4-MV field chroma macroblock (both U and V)
+/** Do motion compensation for 4-MV interlaced frame chroma macroblock (both U and V)
  */
 static void vc1_mc_4mv_chroma4(VC1Context *v)
 {