1 files changed, 5 insertions, 0 deletions
diff --git a/libavutil/opt.h b/libavutil/opt.h
index 68d2c798e2..f8eea6bc2a 100644
--- a/libavutil/opt.h
+++ b/libavutil/opt.h
@@ -160,6 +160,11 @@ const AVOption *av_next_option(void *obj, const AVOption *last);
  */
 int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags);
 
+/**
+ * Set the values of all AVOption fields to their default values.
+ *
+ * @param s an AVOption-enabled struct (its first member must be a pointer to AVClass)
+ */
 void av_opt_set_defaults(void *s);
 void av_opt_set_defaults2(void *s, int mask, int flags);