diff --git a/pageserver/src/tenant/timeline/handle.rs b/pageserver/src/tenant/timeline/handle.rs
index 59f399d01a..b8bc2ba2aa 100644
--- a/pageserver/src/tenant/timeline/handle.rs
+++ b/pageserver/src/tenant/timeline/handle.rs
@@ -114,13 +114,13 @@
 //!
 //! The attentive reader may have noticed the following reference cycle around the `Arc<Timeline>`:
 //!
-//! ```
+//! ```text
 //! Timeline --owns--> PerTimelineState --strong--> HandleInner --strong--> WeakHandle --strong--> Timeline
 //! ```
 //!
 //! Further, there is this cycle:
 //!
-//! ```
+//! ```text
 //! Timeline --owns--> PerTimelineState --strong--> HandleInner --strong--> GateGuard --keepalive--> Timeline
 //! ```
 //!