diff --git a/src/compatibility/5.1/android-5.1-cdd.html b/src/compatibility/5.1/android-5.1-cdd.html
index bd8b17f..df1183f 100644
--- a/src/compatibility/5.1/android-5.1-cdd.html
+++ b/src/compatibility/5.1/android-5.1-cdd.html
@@ -916,12 +916,14 @@
 build from the upstream Android Open Source Project for Android 5.1. This build
 includes a specific set of functionality and security fixes for the WebView [<a href="http://www.chromium.org/">Resources, 13</a>].</li>
   <li>The user agent string reported by the WebView MUST be in this format:
-<p>Mozilla/5.1 (Linux; Android $(VERSION); $(MODEL) Build/$(BUILD))
+<p>Mozilla/5.1 (Linux; Android $(VERSION); $(MODEL) Build/$(BUILD)$(WEBVIEW))
 AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 $(CHROMIUM_VER) Mobile
 Safari/537.36</p>
   <ul>
     <li>The value of the $(VERSION) string MUST be the same as the value for
 android.os.Build.VERSION.RELEASE.</li>
+    <li>The $(WEBVIEW) string MAY be omitted, but if included MUST be "; wv" to
+        note that this is a webview</li>
     <li>The value of the $(MODEL) string MUST be the same as the value for
 android.os.Build.MODEL.</li>
     <li>The value of the $(BUILD) string MUST be the same as the value for
@@ -4816,4 +4818,4 @@
 
 </div>
 </body>
-</html>
\ No newline at end of file
+</html>