diff --git a/examples/MultiReaders.py b/examples/MultiReaders.py
index 942acea..f73ad22 100644
--- a/examples/MultiReaders.py
+++ b/examples/MultiReaders.py
@@ -2,6 +2,8 @@ from mfrc522 import MFRC522
 import utime
 
 
+# youtube short video about it https://www.youtube.com/watch?v=wE2AamTF5dg
+
 def uidToString(uid):
     mystring = ""
     for i in uid:
@@ -73,4 +75,4 @@ try:
         utime.sleep_ms(50)                
 
 except KeyboardInterrupt:
-    pass
\ No newline at end of file
+    pass