diff --git a/timestamp.vim b/timestamp.vim
index 2f7d361..0fe6d68 100644
--- a/timestamp.vim
+++ b/timestamp.vim
@@ -1,2 +1,3 @@
+let timestamp_regexp = '\v\C%(<Last %([cC]hanged?|[Mm]odified):\s+)@<=.*$'
 autocmd VimEnter * EnableTimestamp