diff --git a/src/textual/timer.py b/src/textual/timer.py
index 1d31af4b14..bf086262d0 100644
--- a/src/textual/timer.py
+++ b/src/textual/timer.py
@@ -23,7 +23,7 @@
 
 
 class EventTargetGone(Exception):
-    pass
+    """Raised if the timer event target has been deleted prior to the timer event being sent."""
 
 
 @rich_repr