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+++ b/README.md
@@ -561,3 +561,14 @@ Traverse between important code points in HTML.
 - `<C-M-right>` is "Next Edit Point" (`M-x emmet-next-edit-point`)
 
 For further information and demo see [Emmet's documentation](http://docs.emmet.io/actions/go-to-edit-point/).
+
+## Development Notes
+
+When working on emmet-mode, DO NOT directly edit `emmet-mode.el`.  It is generated from the files in the `/src` directory by `make`.  When making changes, make them to the relevant source file, then run:
+
+```sh
+make clean
+make
+```
+
+in the root directory of your emmet-mode repository.