diff --git a/docs/conf.py b/docs/conf.py
index c49dfe15b7..6d053663d8 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -72,10 +72,9 @@
 templates_path = ['_templates']
 
 # The suffix(es) of source filenames.
-# You can specify multiple suffix as a list of string:
+# You can specify multiple suffix as a dict:
 #
-# source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
+# source_suffix = {'.rst': 'restructuredtext'}
 
 # The encoding of source files.
 #