diff --git a/libfreefare/freefare.h b/libfreefare/freefare.h
index 1189b97..4d571bc 100644
--- a/libfreefare/freefare.h
+++ b/libfreefare/freefare.h
@@ -141,6 +141,9 @@ extern const MadAid mad_reserved_aid;
 extern const MadAid mad_card_holder_aid;
 extern const MadAid mad_not_applicable_aid;
 
+/* NFC Forum AID */
+extern const MadAid mad_nfcforum_aid;
+
 Mad		 mad_new (const uint8_t version);
 Mad		 mad_read (MifareTag tag);
 int		 mad_write (MifareTag tag, Mad mad, const MifareClassicKey key_b_sector_00, const MifareClassicKey key_b_sector_10);
diff --git a/libfreefare/mad.c b/libfreefare/mad.c
index 3aff410..f81cb13 100644
--- a/libfreefare/mad.c
+++ b/libfreefare/mad.c
@@ -24,6 +24,10 @@
  * AN10787
  * MIFARE Application Directory (MAD)
  * Rev. 04 - 5 March 2009
+ *
+ * NXP Type MF1K/4K Tag Operation
+ * Storing NFC Forum data in Mifare Standard 1k/4k
+ * Rev. 1.1 - 21 August 2007
  */
 #include "config.h"
 
@@ -65,7 +69,7 @@ struct mad {
     uint8_t version;
 };
 
-/* Read key A */
+/* Public Key A value of MAD sector(s) */
 const MifareClassicKey mad_public_key_a = {
     0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5
 };
@@ -97,6 +101,12 @@ const MadAid mad_not_applicable_aid = {
     .application_code = 0x05,
 };
 
+/* NFC Forum AID */
+const MadAid mad_nfcforum_aid = {
+    .function_cluster_code = 0xe1,
+    .application_code = 0x03,
+};
+
 /*
  * Allocate an empty new MAD.
  */