diff --git a/.gitignore b/.gitignore
index 269eabf..edf1b0c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 *.jpg
 *.txt
 *.pdf
-.idea
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+.idea
+cryptpng
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diff --git a/README.md b/README.md
index 4bab7c9..25207d1 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,13 @@
-# cryptpng
+# Cryptpng
 
-A proof of concept implementation of storing encrypted data inside of png metadata chunks.
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+A proof of concept implementation of storing encrypted data inside of png metadata chunks.
+
+## Usage
+
+```shell script
+# encrypt
+cryptpng --image <name of the image> --in <input file> --out <output file>
+
+# decrypt
+cryptpng --decrypt --image <crypt image> --out <decrypted output file>
+```
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