diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index dd3439500d94aeedd1d7f5315726bb6765102448..2b3d1b5a299105e041652dd73aa79d69f15dd792 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -556,10 +556,10 @@ void avfilter_end_frame(AVFilterLink *link);
  */
 void avfilter_draw_slice(AVFilterLink *link, int y, int h);
 
-/** Initialize the filter system. Registers all builtin filters */
+/** Initializes the filter system. Registers all builtin filters. */
 void avfilter_register_all(void);
 
-/** Uninitialize the filter system. Unregisters all filters */
+/** Uninitializes the filter system. Unregisters all filters. */
 void avfilter_uninit(void);
 
 /**