Update Source/ARTLocalDevice.m

Co-authored-by: Lawrence Forooghian <[email protected]>

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; // pickup some value that exists for the updated installations with already registered device
+        clientId = identityTokenDetails.clientId; // Older versions of the SDK did not persist clientId, so as a fallback when loading data persisted by these versions we use the clientId of the stored identity token
         [storage setObject:clientId forKey:ARTClientIdKey];
     }
     device.clientId = clientId;