diff --git a/bookmobile b/bookmobile
index 6d73713..9b9aa1b 100755
--- a/bookmobile
+++ b/bookmobile
@@ -84,7 +84,13 @@ function process_article
   switch $format
     case html
       #just a placeholder
-      echo "Html saved to " $output
+
+      if test (string match 'http*' $url )
+        echo "Html saved to " $output
+      else
+        echo "Error. Html requires URLs beginning http/https:"
+      end
+
     case reader
       pandoc -s $output/$title.html -c $theme -o $output/$title-article.html
       rm -f $output/$title.html