diff --git a/src/libextra/json.rs b/src/libextra/json.rs
index 2f17e4a741761..00b172dda0328 100644
--- a/src/libextra/json.rs
+++ b/src/libextra/json.rs
@@ -14,7 +14,7 @@
 #[forbid(non_camel_case_types)];
 #[allow(missing_doc)];
 
-//! json serialization
+//! json parsing and serialization
 
 use std::iterator;
 use std::float;