1 files changed, 3 insertions, 0 deletions

diff --git a/ACE/NEWS b/ACE/NEWS
index dd5a0c3fd96..1fce8d2e2fd 100644
--- a/ACE/NEWS
+++ b/ACE/NEWS
@@ -1,6 +1,9 @@
 USER VISIBLE CHANGES BETWEEN ACE-6.5.5 and ACE-6.5.6
 ====================================================
 
+. On Linux, the ACE_Log_Msg format specifier `%t` is now replaced with the
+  system thread id provided by gettid(), instead of the much longer pthread id.
+
 USER VISIBLE CHANGES BETWEEN ACE-6.5.4 and ACE-6.5.5
 ====================================================