diff --git a/compiler/rustc_middle/src/mir/mono.rs b/compiler/rustc_middle/src/mir/mono.rs
index 46f9ace26cd..92a1094bbcd 100644
--- a/compiler/rustc_middle/src/mir/mono.rs
+++ b/compiler/rustc_middle/src/mir/mono.rs
@@ -182,6 +182,7 @@ impl<'tcx> MonoItem<'tcx> {
         .map(|hir_id| tcx.hir().span(hir_id))
     }
 
+    // Only used by rustc_codegen_cranelift
     pub fn codegen_dep_node(&self, tcx: TyCtxt<'tcx>) -> DepNode {
         crate::dep_graph::make_compile_mono_item(tcx, self)
     }