diff --git a/lib/codegen/meta/gen_legalizer.py b/lib/codegen/meta/gen_legalizer.py
index 104574b7b6..2312071173 100644
--- a/lib/codegen/meta/gen_legalizer.py
+++ b/lib/codegen/meta/gen_legalizer.py
@@ -356,7 +356,7 @@ def gen_xform(xform, fmt, type_sets):
 
 def gen_xform_group(xgrp, fmt, type_sets):
     # type: (XFormGroup, Formatter, UniqueTable) -> None
-    fmt.doc_comment("Legalize the instruction pointed to by `pos`.")
+    fmt.doc_comment("Legalize `inst`.")
     fmt.line('#[allow(unused_variables,unused_assignments,non_snake_case)]')
     with fmt.indented('pub fn {}('.format(xgrp.name)):
         fmt.line('inst: ir::Inst,')