diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 54b06ef..9d5f208 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -21,6 +21,7 @@ The `tag` should be one of the following:
 - `test` - for adding or correcting tests
 - `style` - for changes to the linter or formatter configuration and its results
 - `docs` - for changes to documentation only
+- `ci` - for changes to the CI and its configuration
 - `other` - for anything that isn't covered by the tags above
 
 If a change is a breaking change then that should be indicated by adding a `!` after the tag.