diff --git a/_licenses/isc.txt b/_licenses/isc.txt
index 6cb6461..2555703 100644
--- a/_licenses/isc.txt
+++ b/_licenses/isc.txt
@@ -7,6 +7,11 @@ description: A permissive license lets people do anything with your code with pr
 
 how: Create a text file (typically named LICENSE or LICENSE.txt) in the root of your source code and copy the text of the license into the file. Replace [year] with the current year and [fullname] with the name (or names) of the copyright holders.
 
+using:
+  - documentation.js: https://github.com/documentationjs/documentation/blob/master/LICENSE
+  - Node.js semver: https://github.com/npm/node-semver/blob/master/LICENSE
+  - OpenStreetMap iD: https://github.com/openstreetmap/iD/blob/master/LICENSE
+
 conditions:
   - include-copyright