diff --git a/Patches.md b/Patches.md
index 6fca47c..e97102a 100644
--- a/Patches.md
+++ b/Patches.md
@@ -17,7 +17,7 @@ Now, hack at Tahoe-LAFS!
 
 Once you think you have solved the issue run the test suite with `tox`. This ensures that you didn't accidentally break something while working on your patch.
 
-Now that all of the existing unit tests pass, [write your own tests](https://tahoe-lafs.org/trac/tahoe-lafs/wiki/HowToWriteTests) for the ticket if they don't already exist, and make sure that they pass. Also ensure that `make pyflakes` finds no errors or warnings.
+Now that all of the existing unit tests pass, [write your own tests](https://tahoe-lafs.org/trac/tahoe-lafs/wiki/HowToWriteTests) for the ticket if they don't already exist, and make sure that they pass. Also ensure that `tox -e codechecks` finds no errors or warnings.
 
 Finally, push your branch to Github and [open a pull request](https://help.github.com/articles/creating-a-pull-request). Please add the tag `review-needed` to the ticket and add a link to the pull request. If you had trouble writing unit tests for your patch, don't worry. Submit the pull request anyway and add the tag `test-needed` to the ticket.