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-rw-r--r--src/librustc/traits/auto_trait.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/librustc/traits/auto_trait.rs b/src/librustc/traits/auto_trait.rs
index a4beb6fab12..4d52d7132df 100644
--- a/src/librustc/traits/auto_trait.rs
+++ b/src/librustc/traits/auto_trait.rs
@@ -8,6 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+//! Support code for rustdoc and external tools . You really don't
+//! want to be using this unless you need to.
+
 use super::*;
 
 use std::collections::hash_map::Entry;