diff --git a/doc/contributing/diagnostic-tooling-support-tiers.md b/doc/contributing/diagnostic-tooling-support-tiers.md
index 3a3d5298d75710..f92a5242b7b85b 100644
--- a/doc/contributing/diagnostic-tooling-support-tiers.md
+++ b/doc/contributing/diagnostic-tooling-support-tiers.md
@@ -26,7 +26,7 @@ the following tiers.
     organization or website;
   * The tool must be working on all supported platforms;
   * The tool must only be using APIs exposed by Node.js as opposed to
-    its dependencies; and
+    its dependencies;
   * The tool must be open source.
 
 * Tier 2 - Must be working (CI tests passing) for all