diff --git a/lib/train/transports/azure.rb b/lib/train/transports/azure.rb
index 322c9b4c..708eddb8 100644
--- a/lib/train/transports/azure.rb
+++ b/lib/train/transports/azure.rb
@@ -31,6 +31,7 @@ class Connection < BaseConnection
       DEFAULT_FILE = ::File.join(Dir.home, ".azure", "credentials")
 
       def initialize(options)
+        warn("Azure Connection with Train will be deprecated from Train 4")
         @apis = {}
 
         # Override for any cli options