diff --git a/README.md b/README.md
index adc2f4d..fc96eca 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,17 @@
+# Building
+
+```shell
+go build .
+```
+
+# Usage
+
+Just ensure to have a file called `index.txt` in your current working directory.
+
+```shell
+./gocaexpired
+```
+
 # Documentation
 
 * [OpenSSL Index Format](https://pki-tutorial.readthedocs.io/en/latest/cadb.html)