diff --git a/docs/library/_thread.rst b/docs/library/_thread.rst
new file mode 100644
index 0000000000..47c1c2392d
--- /dev/null
+++ b/docs/library/_thread.rst
@@ -0,0 +1,12 @@
+:mod:`_thread` -- multithreading support
+========================================
+
+.. module:: _thread
+   :synopsis: multithreading support
+
+|see_cpython_module| :mod:`python:_thread`.
+
+This module implements multithreading support.
+
+This module is highly experimental and its API is not yet fully settled
+and not yet described in this documentation.
diff --git a/docs/library/index.rst b/docs/library/index.rst
index 0789ea43d9..b141abf1e6 100644
--- a/docs/library/index.rst
+++ b/docs/library/index.rst
@@ -88,6 +88,7 @@ it will fallback to loading the built-in ``ujson`` module.
        ustruct.rst
        utime.rst
        uzlib.rst
+       _thread.rst
 
 .. only:: port_pyboard
 
@@ -114,6 +115,7 @@ it will fallback to loading the built-in ``ujson`` module.
        ustruct.rst
        utime.rst
        uzlib.rst
+       _thread.rst
 
 .. only:: port_wipy