diff --git a/README.md b/README.md
index 4b945bc..4ab6e8b 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,10 @@
 
 Converts any string into a sigil based on corresponding [planetary magic squares](https://en.wikipedia.org/wiki/Magic_square#Europe_after_15th_century).
 
+```
+sigilize.py <string to be sigilized> <planet name> <filename>
+```
+
 ## Install Dependencies
 
 ```