diff --git a/doc/extapi/conf.py b/doc/extapi/conf.py
index 09105248a..4cc5c6803 100644
--- a/doc/extapi/conf.py
+++ b/doc/extapi/conf.py
@@ -42,6 +42,7 @@ extensions = [
     'sphinx.ext.autodoc',
     'sphinx.ext.napoleon',
 ]
+autodoc_member_order = 'bysource'
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']