Show warning for bad URLs
diff --git a/www/roster/views/person/urls.js.rb b/www/roster/views/person/urls.js.rb
index d281a58..49ff89e 100644
--- a/www/roster/views/person/urls.js.rb
+++ b/www/roster/views/person/urls.js.rb
@@ -36,7 +36,14 @@
             end
           else
             _ul committer.urls do |url|
-              _li {_a url, href: url}
+              if url =~ %r{^https?://}
+                _li {_a url, href: url}
+              else
+                _li.bg_warning do
+                  _ url
+                  _ ' - (invalid: must start with https?://)'
+                end
+              end
             end
           end
       end