diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 78b2d0aed5045de238446e145daa9c43d9b9d1b1..70035ab9a956394822950817e5ea49a78d9e8e51 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -57,7 +57,7 @@ The following is a set of guidelines for contributing to ISIS3.
 * You must provide test data for any new or modified tests.
 * You must have a Redmine issue assigned to you before submitting a pull request.
 * You must complete the Developer Checklist before submitting your pull request.
-* When submitting a pull request, you must include the Redmine issue number in the title of the pull request. Use the "Fixes #0000" format.
+* When submitting a pull request, you must include the Redmine issue number in the title of the pull request. Use the "Fixes #0000" format (#0000 being the Redmine ticket number).
 
 ## What can I expect from the ISIS3 development team?
 ### Response Time