diff --git a/tools.go b/tools.go
index d22c727..95b5bdd 100644
--- a/tools.go
+++ b/tools.go
@@ -2,4 +2,6 @@
 
 package gotemplate
 
+// External tools.  See https://github.com/golang/go/wiki/Modules#how-can-i-track-tool-dependencies-for-a-module
+
 import _ "github.com/golangci/golangci-lint/cmd/golangci-lint"