diff --git a/src/tools/miri/src/concurrency/thread.rs b/src/tools/miri/src/concurrency/thread.rs
index 1b119ae71924..af457848de66 100644
--- a/src/tools/miri/src/concurrency/thread.rs
+++ b/src/tools/miri/src/concurrency/thread.rs
@@ -172,7 +172,7 @@ pub enum BlockReason {
     Futex { addr: u64 },
     /// Blocked on an InitOnce.
     InitOnce(InitOnceId),
-    /// Blocked on epoll
+    /// Blocked on epoll.
     Epoll,
 }