diff --git a/README.md b/README.md
index 85a6669..fdd237c 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Great for unit conversions: https://speedcrunch.org/userguide/advanced.html
 
 ### Astropy
 
-First, clone the submodule with `git submodule init && git submodule update --remote`. Then [build the documentation](https://github.com/astropy/astropy/blob/main/docs/install.rst#building-documentation).
+First, clone the submodule with `git submodule init && git submodule update --remote`. Then [build the documentation](https://github.com/astropy/astropy/blob/main/docs/install.rst#building-documentation) with `tox -e build_docs`.
 
 ### Download web pages
 
diff --git a/astropy b/astropy
index a643a37..314dbe8 160000
--- a/astropy
+++ b/astropy
@@ -1 +1 @@
-Subproject commit a643a37a33f87c2566c1b484066cb6563ef93b3d
+Subproject commit 314dbe860be368465f302f4bc272f73241794dff