diff --git a/vendor.mod b/vendor.mod
index 078cd96e88..90898d3097 100644
--- a/vendor.mod
+++ b/vendor.mod
@@ -116,7 +116,7 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/google/btree v1.1.2 // indirect
-	github.com/google/certificate-transparency-go v1.1.2 // indirect
+	github.com/google/certificate-transparency-go v1.1.2 // indirect; replaced; see "replace" section at the bottom of this file for the actual version.
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/googleapis/gax-go/v2 v2.0.5 // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0 // indirect