diff --git a/server.c b/server.c
index 71853bc..0649b38 100644
--- a/server.c
+++ b/server.c
@@ -89,7 +89,7 @@ static void usage(void)
 /**
  * @details Function for convenient cleanup of resources.
  * @param void Function takes no arguments.
- * @return 
+ * @return 0 on success. Non-zero on failure.
  */
 static int cleanup(void)
 {