diff --git a/README.md b/README.md
index 25842b5..90588ef 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,20 @@
-# Container Action Template
+# doc-build github action
 
-To get started, click the `Use this template` button on this repository [which will create a new repository based on this template](https://github.blog/2019-06-06-generate-new-repositories-with-repository-templates/).
+This action build [sphinx](https://www.sphinx-doc.org/) documentation.
 
-For info on how to build your first Container action, see the [toolkit docs folder](https://github.com/actions/toolkit/blob/master/docs/container-action.md).
+## Inputs
+
+### `docs`
+
+**Required** The location of the documentation source to build. Default `"docs"`.
+
+### `dest`
+
+**Required** The destination directory. Default `"build"`.
+
+## Example usage
+
+uses: andreasofthings/doc-build@v13
+with:
+  docs: 'docs'
+  dest: 'build'
diff --git a/entrypoint.py b/entrypoint.py
index 2d0c971..0d7a403 100755
--- a/entrypoint.py
+++ b/entrypoint.py
@@ -75,13 +75,18 @@ def extract_line_information(line_information: str) -> LineInfo:
 if __name__=='__main__':
     logging.debug("[build documentation] Starting documentation-action build.")
 
+    input = os.environ.get("INPUT_DOCS", 'docs')
+    output = os.environ.get("INPUT_DEST", 'build')
+
+    if os.path.exists(os.path.join(input, "requirements.txt")):
+        import pip
+        pip.main(['install', "-r", os.path.join(input, "requirements.txt")])
+
+
     logfile = os.path.join(tempfile.gettempdir(), "sphinx-log")
     if os.path.exists(logfile):
         os.unlink(logfile)
 
-    input = os.environ.get("INPUT_DOCS", 'docs')
-    output = os.environ.get("INPUT_DEST", 'build')
-
     options = f'--keep-going --no-color -a -q -w {logfile} {input} {output}'
 
     main(options.split(" "))