diff --git a/README.md b/README.md
index 5df550d8c..b61ce007c 100644
--- a/README.md
+++ b/README.md
@@ -80,8 +80,12 @@ make bootstrapemu
 
 To run:
 
-cd emu
-./reader.lua -d ./
+```
+cd emu && ./reader.lua -d ./
+```
+
+You can also specify size of emulator's screen via environment variables.
+For more information, please refer to [koreader-base's README][base-readme].
 
 
 Use ccache
@@ -105,3 +109,5 @@ system.
 
 http://ccache.samba.org
 
+
+[base-readme]:https://github.com/koreader/koreader-base/blob/master/README.md