1 files changed, 3 insertions, 0 deletions
diff --git a/tool/file2lastrev.rb b/tool/file2lastrev.rb
index 8ead4961e7..56e1b9f512 100755
--- a/tool/file2lastrev.rb
+++ b/tool/file2lastrev.rb
@@ -1,6 +1,9 @@
 #!/usr/bin/env ruby
 
 require 'optparse'
+
+# this file run with BASERUBY, which may be older than 1.9, so no
+# require_relative
 require File.expand_path('../vcs', __FILE__)
 
 Program = $0