diff --git a/docs/requirements.txt b/docs/requirements.txt
new file mode 100644
index 0000000..9fe7a7f
--- /dev/null
+++ b/docs/requirements.txt
@@ -0,0 +1,4 @@
+sphinx_rtd_theme
+sphinxcontrib-programoutput
+# This should be removed `sphinx.ext.autodoc` is enough
+# sphinx-automodapi
\ No newline at end of file