diff --git a/doc/reference/param/index.md b/doc/reference/param/index.md
index 48027db24..c2fd74956 100644
--- a/doc/reference/param/index.md
+++ b/doc/reference/param/index.md
@@ -40,7 +40,7 @@
 
 ```{include} serialization.md
 :start-line: 2
-```  
+```
 
 ```{toctree}
 ---