diff --git a/pageserver/src/tenant/timeline/detach_ancestor.rs b/pageserver/src/tenant/timeline/detach_ancestor.rs
index 56c641ee49..8ed1072169 100644
--- a/pageserver/src/tenant/timeline/detach_ancestor.rs
+++ b/pageserver/src/tenant/timeline/detach_ancestor.rs
@@ -297,6 +297,8 @@ impl SharedState {
         // TODO: pause failpoint here to catch the situation where detached timeline is deleted...?
         // we are not yet holding the gate so it could advance to the point of removing from
         // timelines.
+        //
+        // pause failpoint which triggers after activating but before completing here
 
         let Some(timeline) = tenant
             .timelines