Configure intersphinx

docs/conf.py

@@ -42,7 +42,7 @@ for pkg in 'acme', 'letsencrypt-apache', 'letsencrypt-nginx':
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
-#needs_sphinx = '1.0'
+needs_sphinx = '1.0'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
@@ -320,7 +320,9 @@ texinfo_documents = [
 #texinfo_no_detailmenu = False
 
 
-# Example configuration for intersphinx: refer to the Python standard library.
-intersphinx_mapping = {'http://docs.python.org/': None}
+intersphinx_mapping = {
+    'python': ('https://docs.python.org/': None),
+    'acme': ('https://acme-python.readthedocs.org', None),
+}
 
 todo_include_todos = True