diff --git a/discord/ext/commands/core.py b/discord/ext/commands/core.py
index 8eda0a874..3441bf60c 100644
--- a/discord/ext/commands/core.py
+++ b/discord/ext/commands/core.py
@@ -1444,7 +1444,7 @@ def dm_only():
 
     def predicate(ctx):
         if ctx.guild is not None:
-            raise PrivateMessageOnly('This command cannot be used in private messages.')
+            raise PrivateMessageOnly('This command can only be used in private messages.')
         return True
 
     return check(predicate)