diff --git a/docs/Formula-Cookbook.md b/docs/Formula-Cookbook.md
index 66b86634d0..891c484824 100644
--- a/docs/Formula-Cookbook.md
+++ b/docs/Formula-Cookbook.md
@@ -99,7 +99,7 @@ If the software is available under multiple licenses, you should list them all i
 license ["MIT", "GPL-2.0"]
 ```
 
-Note: only specify multiple licenses if the formula gives the user a choice between the licenses. Formulae that have different licenses for different parts of their software should specify only the more restrictive license.
+Note: only specify multiple licenses if the formula gives the user a choice between the licenses. Formulae that have different licenses for different parts of their software should specify only the more restrictive license. For help determining which license is more restrictive, take a look [https://choosealicense.com](https://choosealicense.com/licenses/) or the [Comparison of free and open-source software licences Wikipedia page](https://en.wikipedia.org/wiki/Comparison_of_free_and_open-source_software_licences).
 
 ### Check the build system