diff --git a/helpers/DATA/icecat/bookmarks.html.in b/helpers/DATA/icecat/bookmarks.html.in
index bb573bd..8e64a19 100644
--- a/helpers/DATA/icecat/bookmarks.html.in
+++ b/helpers/DATA/icecat/bookmarks.html.in
@@ -1,3 +1,4 @@
+#filter substitution
 <!DOCTYPE NETSCAPE-Bookmark-file-1>
 <!-- This is an automatically generated file.
      It will be read and overwritten.