diff --git a/docs/building-deployer.md b/docs/building-deployer.md
index 13e16ece..4e052c3f 100644
--- a/docs/building-deployer.md
+++ b/docs/building-deployer.md
@@ -20,7 +20,7 @@ application uses at runtime.
 The deployer image is a Docker container image that has these characteristics:
 
 -   The file system contains metadata files that define various aspects of
-    deploying the application. One important purpose of the metadata is to is to
+    deploying the application. One important purpose of the metadata is to
     define the UI for users who are deploying the application from the Google
     Cloud Console.