diff --git a/src/doc/unstable-book/src/language-features/param-attrs.md b/src/doc/unstable-book/src/language-features/param-attrs.md
index 5e649487525b7..4b83c204ba105 100644
--- a/src/doc/unstable-book/src/language-features/param-attrs.md
+++ b/src/doc/unstable-book/src/language-features/param-attrs.md
@@ -24,4 +24,4 @@ fn len(
 {
   slice.len()
 }
-```
\ No newline at end of file
+```