diff --git a/winsup/cygwin/release/3.1.6 b/winsup/cygwin/release/3.1.6
new file mode 100644
index 000000000..d64ee4c92
--- /dev/null
+++ b/winsup/cygwin/release/3.1.6
@@ -0,0 +1,11 @@
+What changed:
+-------------
+
+- Support more IPPROTO_TCP socket options: TCP_FASTOPEN, TCP_KEEPIDLE,
+  TCP_KEEPCNT, TCP_KEEPINTVL, TCP_QUICKACK, TCP_USER_TIMEOUT.
+
+
+Bug Fixes:
+----------
+
+- Fix IPPROTO_TCP option handling, especially in terms of TCP_MAXSEG.
diff --git a/winsup/doc/new-features.xml b/winsup/doc/new-features.xml
index 32479de5d..ca64b7a6f 100644
--- a/winsup/doc/new-features.xml
+++ b/winsup/doc/new-features.xml
@@ -90,6 +90,11 @@ Support WSL symlinks.  Create those by default now.
 FIFOs can now be opened multiple times for reading.
 </para></listitem>
 
+<listitem><para>
+Support more IPPROTO_TCP socket options: TCP_FASTOPEN, TCP_KEEPIDLE,
+TCP_KEEPCNT, TCP_KEEPINTVL, TCP_QUICKACK, TCP_USER_TIMEOUT.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>