diff --git a/src/dox.rs b/src/dox.rs
index fbec3f2d..41aac385 100644
--- a/src/dox.rs
+++ b/src/dox.rs
@@ -26,6 +26,9 @@ mod imp {
     #[lang = "copy"]
     pub trait Copy {}
 
+    #[lang = "freeze"]
+    pub trait Freeze {}
+
     #[lang = "sync"]
     pub trait Sync {}
     impl<T> Sync for T {}