diff --git a/Cartfile.resolved b/Cartfile.resolved
index 8dff7a8..2e209cd 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1,3 +1,3 @@
+github "daltoniam/Starscream" "3.0.2"
 github "daltoniam/common-crypto-spm" "1.1.0"
 github "daltoniam/zlib-spm" "1.1.0"
-github "daltoniam/Starscream" "3.0.2"
diff --git a/Source/SocketIO/Client/SocketIOClient.swift b/Source/SocketIO/Client/SocketIOClient.swift
index 6acb536..50c8aa7 100644
--- a/Source/SocketIO/Client/SocketIOClient.swift
+++ b/Source/SocketIO/Client/SocketIOClient.swift
@@ -41,6 +41,8 @@ open class SocketIOClient : NSObject, SocketIOClientSpec, SocketEngineClient, So
 
     /// The queue that all interaction with the client should occur on. This is the queue that event handlers are
     /// called on.
+    ///
+    /// **This should be a serial queue! Concurrent queues are not supported and might cause crashes and races**.
     @objc
     public var handleQueue = DispatchQueue.main