diff --git a/vba_code_kotsu_master.bas b/vba_code_kotsu_master.bas
index 644d86c..f01e8da 100644
--- a/vba_code_kotsu_master.bas
+++ b/vba_code_kotsu_master.bas
@@ -203,3 +203,7 @@ Sub Z1_validateDetailDataButton()
     
     MsgBox "Validation complete. Errors: " & errorCount, vbInformation
 End Sub
+
+Sub Z1_SortDataRowsByC()
+    Call SortDataRows(3)
+End Sub
\ No newline at end of file