diff --git a/docs/INSTALL.md b/docs/INSTALL.md
index a80bee6c6..6de6eaceb 100644
--- a/docs/INSTALL.md
+++ b/docs/INSTALL.md
@@ -30,6 +30,12 @@ Requires [Go] v1.12 or higher:
 go install sigs.k8s.io/kustomize/v3/cmd/kustomize
 ```
 
+> With [Go v1.12](https://golang.org/doc/go1.12#modules), prefix the above command with `GO111MODULE=on`, e.g.
+> ```
+> GO111MODULE=on go install sigs.k8s.io/kustomize/v3/cmd/kustomize
+> ```
+> This shouldn't be necessary with [Go v1.13](https://golang.org/doc/go1.13#modules).
+
 ### Other methods
 
 #### macOS