diff --git a/README.md b/README.md
index 7470057..61aca77 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # dir-size
-A simple dotnet global tool to display the size of each sub-dir.
+A simple dotnet global tool to calculate the size of each sub-dir.
 
 ## Install:
 
@@ -9,6 +9,18 @@ dotnet tool install --global dir-size
 
 ## Usage:
 
+```bash
+Usage: dir-size [options]
+
+Options:
+  -v|--version  Show version information
+  -?|-h|--help  Show help information
+  -d|--dir      The directory to work with, default is the current dir
+  -s|--sort     Sort by size
+```
+
+### Example:
+
 Current directory:
 ```bash
 dir-size
@@ -19,5 +31,5 @@ dir-size -d path/to/dir
 ```
 Sort by size:
 ```bash
-dir-size -s
+dir-size -s -d path/to/dir
 ```