diff --git a/Source/ARTLocalDevice.m b/Source/ARTLocalDevice.m
index c346bfbd8..4ad41cf2f 100644
--- a/Source/ARTLocalDevice.m
+++ b/Source/ARTLocalDevice.m
@@ -97,7 +97,7 @@ + (instancetype)deviceWithStorage:(id<ARTDeviceStorage>)storage logger:(nullable
 
     NSString *clientId = [storage objectForKey:ARTClientIdKey];
     if (clientId == nil && identityTokenDetails.clientId != nil) {
-        clientId = identityTokenDetails.clientId;
+        clientId = identityTokenDetails.clientId; // pickup some value that exists for the updated installations with already registered device
         [storage setObject:clientId forKey:ARTClientIdKey];
     }
     device.clientId = clientId;