diff --git a/README.md b/README.md
index 43b9f1c..266559f 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,13 @@ git clone https://github.com/cupcakearmy/dotfiles.git ~/.dotfiles
 cd ~/.dotfiles
 ./install
 ```
+
+## Encrypted files.
+
+Files under `./secrets` are encrypted. To unlock the `git-crypt` must be installed.
+Assuming we have the base64 version of the `key.txt` we can unlock the repo with the following commands:
+
+```bash
+base64 --decode key.txt > key
+git-crypt unlock ./key
+```