diff --git a/lib/structures/Guild.js b/lib/structures/Guild.js
index e69a74422..b4196f246 100644
--- a/lib/structures/Guild.js
+++ b/lib/structures/Guild.js
@@ -319,7 +319,7 @@ class Guild extends Base {
     /**
     * Ban a user from the guild
     * @arg {String} userID The ID of the member
-    * @arg {Number} [deleteMessageDays=0] Number of days to delete messages for
+    * @arg {Number} [deleteMessageDays=0] Number of days to delete messages for, between 0-7 inclusive
     * @arg {String} [reason] Reason for the ban
     * @returns {Promise}
     */
diff --git a/lib/structures/Member.js b/lib/structures/Member.js
index a0e116c7d..7488d2d76 100644
--- a/lib/structures/Member.js
+++ b/lib/structures/Member.js
@@ -175,7 +175,7 @@ class Member extends Base {
 
     /**
     * Ban the user from the guild
-    * @arg {Number} [deleteMessageDays=0] Number of days to delete messages for
+    * @arg {Number} [deleteMessageDays=0] Number of days to delete messages for, between 0-7 inclusive
     * @arg {String} [reason] The reason to be displayed in audit logs
     * @returns {Promise}
     */