diff --git a/src/services/pis.services.ts b/src/services/pis.services.ts
index 1b7b478..4feffa3 100644
--- a/src/services/pis.services.ts
+++ b/src/services/pis.services.ts
@@ -44,6 +44,8 @@ async function findPisByCode(code: string) {
 }
 
 async function findByTiplocArray(tiplocArray: string[]) {
+  // If any of the TIPLOCS in an array is RDG4AB - Replace it with READING.
+  // ^^ Double check those though before doing it.
   const query = {
     tiplocs: tiplocArray,
   };