diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 1008ac8b6613d5b6e6db7c2de9ba185a82d7a22c..e956f73ff04c76f190421fde23d6cf564900c2d7 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2768,7 +2768,10 @@ void avcodec_default_free_buffers(AVCodecContext *s);
 /* misc useful functions */
 
 /**
- * returns a single letter to describe the picture type
+ * Returns a single letter to describe the given picture type \p pict_type.
+ *
+ * @param[in] pict_type The picture type.
+ * @return A single character representing the picture type.
  */
 char av_get_pict_type_char(int pict_type);