diff --git a/doc/source/conf.py b/doc/source/conf.py
index 8ef4ca9a2d..22059c4818 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -103,7 +103,7 @@ stg = imp.load_source(
     'scenario_table_gen',
     os.path.join(CONF_PATH, 'scenario_table_gen.py')
 )
-with open(TABLE_FILE, 'a+') as f:
+with open(TABLE_FILE, 'w') as f:
     f.write(stg.main())
 
 # If extensions (or modules to document with autodoc) are in another directory,
diff --git a/doc/source/scenario_table_gen.py b/doc/source/scenario_table_gen.py
index 5bc743ea5e..166c21f143 100644
--- a/doc/source/scenario_table_gen.py
+++ b/doc/source/scenario_table_gen.py
@@ -41,7 +41,7 @@ def main():
     for items in scenario_meta_data.values():
         for item in items:
             config_items.add(item['name'].split('.')[0])
-    config_items = list(config_items)
+    config_items = list(sorted(config_items))
 
     for item in config_items:
         HTML_TABLE += '<tr>'