diff --git a/crates/ra_hir/src/docs.rs b/crates/ra_hir/src/docs.rs
index 330d8f8f456e..b1b47af9e634 100644
--- a/crates/ra_hir/src/docs.rs
+++ b/crates/ra_hir/src/docs.rs
@@ -2,6 +2,7 @@ use ra_syntax::ast;
 
 use crate::HirDatabase;
 
+/// Holds documentation
 #[derive(Debug, Clone)]
 pub struct Documentation(String);