@@ -34,8 +34,9 @@ typedef struct AVFilterPool {

 } AVFilterPool;

 typedef struct AVFilterCommand {

-    double time;

-    char *command, *arg;

+    double time;                ///< time expressed in seconds

+    char *command;              ///< command

+    char *arg;                  ///< optional argument for the command

     int flags;

     struct AVFilterCommand *next;

 } AVFilterCommand;