diff --git a/content/guides/author-libraries.md b/content/guides/author-libraries.md
index aa599a328e02..302b9b3139d9 100644
--- a/content/guides/author-libraries.md
+++ b/content/guides/author-libraries.md
@@ -127,6 +127,8 @@ module.exports = {
 
 This means that your library expects a dependency named `lodash` to be available in the consumer's environment.
 
+If your libary targets UMD, it's important to add all of the above mentioned ways of loading the external (`commonjs`, `commonjs2`, `amd` and `root`) as leaving one out will cause strange errors for a consumer trying to load your library in that environment.
+
 
 ### Add `libraryTarget`