diff --git a/src/mongo/base/error_codes.yml b/src/mongo/base/error_codes.yml
index f3e3571eda5..97c92b794fd 100644
--- a/src/mongo/base/error_codes.yml
+++ b/src/mongo/base/error_codes.yml
@@ -1177,5 +1177,13 @@ error_codes:
       categories: [RetriableError],
     }
 
+  # Reserved for future load-shedding specific rejection code.
+  # Keep unused for now until mongo-side code is finalized and rolled out.
+  - {
+      code: 489,
+      name: SearchRequestRejectedDueToOverload,
+      categories: [SystemOverloadedError],
+    }
+
   # ^^^^
   # Add new codes, sequentially numbered, above.