diff --git a/doc/source/conf.py b/doc/source/conf.py
index dc0959ec..1b1f4148 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -50,7 +50,7 @@
 templates_path = ["_templates"]
 
 # The suffix of source filenames.
-source_suffix = [".rst", ".md"]
+source_suffix = ".rst"
 
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'