diff --git a/docs/PreReleaseNotes.txt b/docs/PreReleaseNotes.txt
index 0f9c330c14f..fe176c75042 100644
--- a/docs/PreReleaseNotes.txt
+++ b/docs/PreReleaseNotes.txt
@@ -15,6 +15,7 @@ Prerelease Notes
   * **[Posix]** enable LITE feature in Posix preload library.
 
 + **Major bug fixes**
+  * **[Client]** Avoid deadlock between FSH deletion and Tick() timeout.
 
 + **Minor bug fixes**
   * **[Server]** Correct debug message interval for free space report.