diff --git a/mvcc/revision.go b/mvcc/revision.go
index 5fa35a1c2a2..d6213866f26 100644
--- a/mvcc/revision.go
+++ b/mvcc/revision.go
@@ -27,7 +27,7 @@ type revision struct {
 	// main is the main revision of a set of changes that happen atomically.
 	main int64
 
-	// sub is the the sub revision of a change in a set of changes that happen
+	// sub is the sub revision of a change in a set of changes that happen
 	// atomically. Each change has different increasing sub revision in that
 	// set.
 	sub int64