diff --git a/doc/7-systems/pokey.md b/doc/7-systems/pokey.md
index afb53931c..8bbb04b78 100644
--- a/doc/7-systems/pokey.md
+++ b/doc/7-systems/pokey.md
@@ -44,6 +44,10 @@ when two channels are joined for filtered output, the channel bar will show `fil
 
 when two channels are joined for wide period range, the channel bar will show `16-bit` on a bracket tying them together.
 
+## ROM export
+
+a song can be exported as SAP-R, a compressed register dump. more details on the format are available (in Polish) at [its page on the Atariki wiki](http://atariki.krap.pl/index.php/SAP_%28format_pliku%29).
+
 ## chip config
 
 the following options are available in the Chip Manager window: