diff --git a/Interpolation.md b/Interpolation.md
index 0e75d54..50e970c 100644
--- a/Interpolation.md
+++ b/Interpolation.md
@@ -8,6 +8,7 @@ Where something can be one of the following:
 * **COMMIT** - The commit hash
 * **SHORT_COMMIT** - The shortened version of the commit hash
 * **COMMIT_EMAIL** - The email address of the committer
+* **COMMIT_MESSAGE** - The message written by the committer
 * **COMMIT_URI** - The URL to the commit
 * **BRANCH** - The name of the branch
 * **BRANCH_URI** - The URL to the branch