diff --git a/compiler/rustc_hir/src/target.rs b/compiler/rustc_hir/src/target.rs
index 682e1167f03..96dd00ec5cf 100644
--- a/compiler/rustc_hir/src/target.rs
+++ b/compiler/rustc_hir/src/target.rs
@@ -131,6 +131,7 @@ pub fn from_item(item: &Item<'_>) -> Target {
         }
     }
 
+    // FIXME: For now, should only be used with def_kinds from ItemIds
     pub fn from_def_kind(def_kind: DefKind) -> Target {
         match def_kind {
             DefKind::ExternCrate => Target::ExternCrate,