diff --git a/servefiles/README.md b/servefiles/README.md
index 1b8f202..f865e8f 100644
--- a/servefiles/README.md
+++ b/servefiles/README.md
@@ -2,4 +2,7 @@
 
 Simple Python script for serving local files to FBI's remote installer. Requires [Python](https://www.python.org/downloads/).
 
-**Usage**: python servefiles.py (ip) (file/directory) \[host ip\]
+**Usage**: python servefiles.py (3ds ip) (file / directory) \[host ip\] \[host port\]
+
+  - the file can be *.cia or *.tik
+  - the directory have to contain *.cia or *.tik files