diff --git a/docs/conf.py b/docs/conf.py
index 7ebc8079..a147ff18 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -65,7 +65,7 @@ def filter(self, record: pylogging.LogRecord) -> bool:
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
 # source_suffix = ['.rst', '.md']
-source_suffix = ".rst"
+source_suffix = {".rst": "restructuredtext"}
 
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'