diff --git a/doc/source/conf.py b/doc/source/conf.py
index 2fa2c1b5b..bef818295 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -75,7 +75,7 @@ def setup(app):
                         break
                 else:
                     line_index = len(real_lines)
-                submodule_lines = real_lines[line_index:]
+                submodule_lines = [b"\n"] + real_lines[line_index:]
 
                 plugins_seen = False
                 with open(os.path.join(dir, filename), "wb") as contents: