diff --git a/docs/app-engine-architecture.md b/docs/app-engine-architecture.md
index 4f71c64f1..9b5045b46 100644
--- a/docs/app-engine-architecture.md
+++ b/docs/app-engine-architecture.md
@@ -187,7 +187,7 @@ explicitly marked as otherwise.
 
 Nomulus comes pre-configured with support for a number of different
 environments, all of which are used in Google's registry system. Other registry
-operators may choose to user more or fewer environments, depending on their
+operators may choose to use more or fewer environments, depending on their
 needs.
 
 The different environments are specified in `RegistryEnvironment`. Most