diff --git a/conf.py b/conf.py
index 032bedb..e097203 100644
--- a/conf.py
+++ b/conf.py
@@ -33,7 +33,7 @@
 templates_path = ['_templates']
 
 # The suffix of source filenames.
-source_suffix = '.rst'
+source_suffix = {".rst": "restructuredtext"}
 
 # The encoding of source files.
 #source_encoding = 'utf-8-sig'