diff --git a/pep-0665.rst b/pep-0665.rst
index aad60648a9f..deb901d7ba2 100644
--- a/pep-0665.rst
+++ b/pep-0665.rst
@@ -122,7 +122,7 @@ file formats:
 #. Pyflow_
 
 Unfortunately, those tools all use differing lock file formats. This
-means tooling around these tools much be unique. This impacts tooling
+means tooling around these tools must be unique. This impacts tooling
 such as code editors and hosting providers, which want to be as
 flexible as possible when it comes to accepting a user's application
 code, but also have a limit as to how much development resources they