diff --git a/winsup/cygwin/release/3.4.0 b/winsup/cygwin/release/3.4.0
index b4a1267a4..5bcdb0580 100644
--- a/winsup/cygwin/release/3.4.0
+++ b/winsup/cygwin/release/3.4.0
@@ -5,6 +5,8 @@ What's new:
 
 - Add code to handle setrlimit(RLIMIT_AS).
 
+- Add code to handle signal masks in /proc/<PID>/status.
+
 
 What changed:
 -------------
diff --git a/winsup/doc/new-features.xml b/winsup/doc/new-features.xml
index 13d69ca9d..4a626c716 100644
--- a/winsup/doc/new-features.xml
+++ b/winsup/doc/new-features.xml
@@ -16,6 +16,10 @@ Drop support for Vista and Server 2008.
 Add code to handle setrlimit(RLIMIT_AS).
 </para></listitem>
 
+<listitem><para>
+- Add code to handle signal masks in /proc/&lt;PID&gt;/status.
+</para></listitem>
+
 <listitem><para>
 The CYGWIN=pipe_byte option is now set by default, so that pipes are
 opened in byte mode rather than message mode.