diff --git a/content/blog/add-external.md b/content/blog/add-external.md
index 205b020..39804bb 100644
--- a/content/blog/add-external.md
+++ b/content/blog/add-external.md
@@ -38,3 +38,9 @@ on how to do this.
 
 Note that **description** needs to be a full sentence, and that **repo** must be a Go-gettable link
 that can be put in `plugins.cfg`.
+
+## Go Modules
+
+Note we found the Go modules can interact badly with how external plugins are compiled into CoreDNS.
+Various external plugins have *removed* the `go.mod` and `go.sum` files entirely to work around
+issues, see for instance [unbound](https://github.com/coredns/unbound/).