diff --git a/lib/errors/spec.js b/lib/errors/spec.js
index dc0b18a6..98068671 100644
--- a/lib/errors/spec.js
+++ b/lib/errors/spec.js
@@ -63,6 +63,9 @@ var errorSpec = [{
 }, {
   name: 'TX_NOT_FOUND',
   message: 'Transaction proposal not found.'
+}, {
+  name: 'MAIN_ADDRESS_GAP_REACHED',
+  message: 'Maximum number of consecutive addresses without activity reached.'
 }];
 
 module.exports = errorSpec;
diff --git a/package.json b/package.json
index 0115d3a5..703d18fc 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "bitcore-wallet-client",
   "description": "Client for bitcore-wallet-service",
   "author": "BitPay Inc",
-  "version": "5.2.0",
+  "version": "5.2.1",
   "license": "MIT",
   "keywords": [
     "bitcoin",