diff --git a/doc/descriptions/unsupported.desc b/doc/descriptions/unsupported.desc
index e7c1954dc..6d7be2f59 100644
--- a/doc/descriptions/unsupported.desc
+++ b/doc/descriptions/unsupported.desc
@@ -1837,6 +1837,13 @@
 :status :unsupported
 :comment "Unsupported. See link for more details."
 
+:model "OpticSlim 550"
+:url "unsupported/plustek-opticslim-550.html"
+:interface "USB"
+:usbid "0x07b3" "0x0c33"
+:status :unsupported
+:comment "GL843 based, to be added to genesys backend"
+
 :model "OpticSlim 2420"
 :url "unsupported/plustek-opticslim-2420.html"
 :interface "USB"