diff --git a/winsup/cygwin/stackdump.sgml b/winsup/cygwin/stackdump.sgml
new file mode 100644
index 000000000..bff76bffd
--- /dev/null
+++ b/winsup/cygwin/stackdump.sgml
@@ -0,0 +1,13 @@
+<sect1 id="func-cygwin-stackdump">
+<title>cygwin_stackdump</title>
+
+<funcsynopsis>
+<funcdef>extern "C" void
+<function>cygwin_stackdump</function></funcdef>
+<void>
+</funcsynopsis>
+
+<para> Outputs a stackdump to stderr from the called location.
+</para>
+
+</sect1>