diff --git a/CD/ATIP.cs b/CD/ATIP.cs
index d51084d6f..f358351e7 100644
--- a/CD/ATIP.cs
+++ b/CD/ATIP.cs
@@ -464,6 +464,9 @@ namespace DiscImageChef.Decoders.CD
                             manufacturer = "CDA Datenträger Albrechts GmbH";
                         break;
                     case 21:
+                        // Seen only once
+                        if (frm == 10)
+                            manufacturer = "GCK";
                         if (frm == 30)
                             manufacturer = "Bestdisc Technology Corporation";
                         if (frm == 40)
diff --git a/ChangeLog b/ChangeLog
index e86c8adc2..3b70044ef 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-12-13  Natalia Portillo  <claunia@claunia.com>
+
+	* CD/ATIP.cs:
+	  Added manufacturer code for a GCK disc I just came upon.
+
 2015-12-04  Natalia Portillo  <claunia@claunia.com>
 
 	* SCSI/Sense.cs: