diff --git a/src/librustc_mir/transform/qualify_min_const_fn.rs b/src/librustc_mir/transform/qualify_min_const_fn.rs
index 43013129541f1..431accf6110ad 100644
--- a/src/librustc_mir/transform/qualify_min_const_fn.rs
+++ b/src/librustc_mir/transform/qualify_min_const_fn.rs
@@ -387,7 +387,8 @@ fn check_terminator(
     }
 }
 
-/// Returns true if the `def_id` refers to an intrisic which we've whitelisted.
+/// Returns true if the `def_id` refers to an intrisic which we've whitelisted
+/// for being called from stable `const fn`s (`min_const_fn`).
 ///
 /// Adding more intrinsics requires sign-off from @rust-lang/lang.
 fn is_intrinsic_whitelisted(tcx: TyCtxt<'a, 'tcx, 'tcx>, def_id: DefId) -> bool {