diff --git a/README.TXT b/README.TXT
index 9356eedb9..a06c75335 100644
--- a/README.TXT
+++ b/README.TXT
@@ -61,3 +61,9 @@ The reader.lua script needs a device argument in order to cope with some
 slight differences between actual readers and the emulation. Run it like
 this:
 	./reader.lua -d emu /PATH/TO/PDF.pdf
+
+By default emulation will provide DXG resolution of 824*1200. It can be
+specified at compile time, this is example for Kindle 3:
+
+	EMULATE_READER_W=600 EMULATE_READER_H=800 EMULATE_READER=1 make kpdfview
+