diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index ccdec2bf89f1..a2c8fdb19506 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -3016,8 +3016,8 @@ impl<'tcx> TyCtxt<'tcx> {
                 | DefKind::AssocConst
                 | DefKind::Ctor(..)
                 | DefKind::AnonConst => self.mir_for_ctfe_opt_const_arg(def),
-                // If the caller wants `mir_for_ctfe` they should not be using `instance_mir`, so
-                // we'll assume const fn also wants the optimized version.
+                // If the caller wants `mir_for_ctfe` of a function they should not be using
+                // `instance_mir`, so we'll assume const fn also wants the optimized version.
                 _ => self.optimized_mir_or_const_arg_mir(def),
             },
             ty::InstanceDef::VtableShim(..)