diff --git a/libavcodec/h264idct_template.c b/libavcodec/h264idct_template.c
index e288f9bf1b..c024538db5 100644
--- a/libavcodec/h264idct_template.c
+++ b/libavcodec/h264idct_template.c
@@ -237,6 +237,7 @@ void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, DCTELEM *
 }
 /**
  * IDCT transforms the 16 dc values and dequantizes them.
+ * @param qmul quantization parameter
  */
 void FUNCC(ff_h264_luma_dc_dequant_idct)(DCTELEM *_output, DCTELEM *_input, int qmul){
 #define stride 16