diff --git a/README.md b/README.md
index 5ee84812..e3ca05ec 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,12 @@ An TTY screenreader for Linux. Be careful, is just experimental now.
 # requirements
 linux
 python3
+python-espeak
+
+# optional 
+sox [using for soundicons via sox]
+speech-dispatcher, python3-speechd [for use the speech-dispatcher]
+brltty, python-brlapi [for using braille]
 
 # installation
 ToDO