diff --git a/librb/src/tools.c b/librb/src/tools.c
index 17a9b45c..4e240e4e 100644
--- a/librb/src/tools.c
+++ b/librb/src/tools.c
@@ -83,7 +83,7 @@ rb_free_rb_dlink_node(rb_dlink_node *ptr)
  *   Changes a given buffer into an array of parameters.
  *   Taken from ircd-ratbox.
  *
- * inputs	- string to parse, array to put in
+ * inputs	- string to parse, array to put in (size >= maxpara+1)
  * outputs	- number of parameters
  */
 int