diff --git a/tools/copyright b/tools/copyright
index 24cdec0..22e7e9a 100755
--- a/tools/copyright
+++ b/tools/copyright
@@ -51,7 +51,7 @@ shopt -s extglob || {
 }
 
 # we will be updating all files that contain this line
-ident='This file is part of GNU ease.js$'
+ident='This \(file\|document\) is part of \(the \)\?GNU ease.js'
 
 ignorepath='.git|build|webroot|node_modules'
 files=$( grep -rl "$ident" ../!($ignorepath) )