diff --git a/crates/ra_hir_def/src/resolver.rs b/crates/ra_hir_def/src/resolver.rs
index 95b3c926dc..c40f41717b 100644
--- a/crates/ra_hir_def/src/resolver.rs
+++ b/crates/ra_hir_def/src/resolver.rs
@@ -61,6 +61,8 @@ pub enum TypeNs {
     GenericParam(u32),
     AdtId(AdtId),
     AdtSelfType(AdtId),
+    // Yup, enum variants are added to the types ns, but any usage of variant as
+    // type is an error.
     EnumVariantId(EnumVariantId),
     TypeAliasId(TypeAliasId),
     BuiltinType(BuiltinType),