diff --git a/doc-src/certinstall/webapp.html b/doc-src/certinstall/webapp.html
index 6cb9ef226..478da96cb 100644
--- a/doc-src/certinstall/webapp.html
+++ b/doc-src/certinstall/webapp.html
@@ -8,3 +8,6 @@ domain **mitm.it**. You should see something like this:
Just click on the relevant icon, and then follow the setup instructions
for the platform you're on.
+
+Make sure you aren't using a bandwith optimizer (like Google's Data Compression
+Proxy on Chrome for Android) or the page will not load.