diff --git a/H/ATOMS b/H/ATOMS
index 299805173..f3c33166b 100644
--- a/H/ATOMS
+++ b/H/ATOMS
@@ -323,6 +323,7 @@ A	Reconsult		N	"reconsult"
 A	RecordedP		F	"$recordep"
 A	RecordedWithKey		F	"$recorded_with_key"
 A	RedefineWarnings	N	"redefine_warnings"
+A	Redo      		F	"redo"
 A	RedoFreeze		F	"$redo_freeze"
 A	RefoundVar		F	"$I_FOUND_THE_VARIABLE_AGAIN"
 A	RelativeTo		F	"relative_to"