diff --git a/static/usage.html b/static/usage.html
index ae9cb9ae..1f6b56eb 100644
--- a/static/usage.html
+++ b/static/usage.html
@@ -968,7 +968,7 @@
                 Service system app. It will use an HTTPS GET request to fetch
                 <code>https://example.com/.well-known/assetlinks.json</code> in order to process a
                 request to verify that an app can handle <code>example.com</code> links. The app
-                needs to have the app id and signing keys authorized by the domain in order for
+                needs to have their app id and signing keys authorized by the domain in order for
                 the verification to succeed.</p>
 
                 <p>These network requests by the Intent Filter Verification Service to verify app