diff --git a/src/services/pis.services.ts b/src/services/pis.services.ts
index f4bbf9c..5d497a6 100644
--- a/src/services/pis.services.ts
+++ b/src/services/pis.services.ts
@@ -118,6 +118,7 @@ function fixErrantTiplocs(input: string[]): void {
     if (value === "RDNG4AB") {
       array[index] = "RDNGSTN";
     }
+    // Additional substitutions can be applied here
   });
 }