diff --git a/libraries/ESP8266WiFi/examples/HTTPSRequest/HTTPSRequest.ino b/libraries/ESP8266WiFi/examples/HTTPSRequest/HTTPSRequest.ino
index 390fe7e75..4989fe85c 100644
--- a/libraries/ESP8266WiFi/examples/HTTPSRequest/HTTPSRequest.ino
+++ b/libraries/ESP8266WiFi/examples/HTTPSRequest/HTTPSRequest.ino
@@ -7,6 +7,11 @@
  *  esp8266/Arduino project continuous integration
  *  build.
  *
+ *  Limitations:
+ *    only RSA certificates
+ *    no support of Perfect Forward Secrecy (PFS)
+ *    TLSv1.2 is supported since SDK 2.4.0-rc1
+ *
  *  Created by Ivan Grokhotkov, 2015.
  *  This example is in public domain.
  */