diff --git a/docs/tutorial/obfuscation.rst b/docs/tutorial/obfuscation.rst
index 63baaf0b..52b98996 100644
--- a/docs/tutorial/obfuscation.rst
+++ b/docs/tutorial/obfuscation.rst
@@ -252,7 +252,7 @@ Some of runtime error messages could be customized. When something is wrong with
 First create :file:`messages.cfg` in the path :file:`.pyarmor`::
 
     $ mkdir .pyarmor
-    $ vi .pyarmor/message.cfg
+    $ vi .pyarmor/messages.cfg
 
 Then edit it. It's a ``.ini`` format file, change the error messages as needed