diff --git a/PRESUBMIT.cfg b/PRESUBMIT.cfg
index e66280f..2fcead1 100644
--- a/PRESUBMIT.cfg
+++ b/PRESUBMIT.cfg
@@ -5,6 +5,7 @@
 stray_whitespace_check: false
 tab_check: false
 tabbed_indent_required_check: false
+signoff_check: true
 
 # Make sure RELEASE_NOTE field is present.
 release_note_field_check: true