diff --git a/guides/source/active_support_instrumentation.md b/guides/source/active_support_instrumentation.md
index ba4678d802..8be992fffd 100644
--- a/guides/source/active_support_instrumentation.md
+++ b/guides/source/active_support_instrumentation.md
@@ -925,7 +925,7 @@ This event is only emitted when using the Google Cloud Storage service.
 Exceptions
 ----------
 
-If an exception happens during any instrumentation the payload will include
+If an exception happens during any instrumentation, the payload will include
 information about it.
 
 | Key                 | Value                                                          |