diff --git a/wiki/linux/dm-crypt.md b/wiki/linux/dm-crypt.md
index 41c4a28..091f5c1 100644
--- a/wiki/linux/dm-crypt.md
+++ b/wiki/linux/dm-crypt.md
@@ -7,3 +7,9 @@
 To create a encrypted device simply run:
 `cryptsetup -y -v luksFormat /dev/sda2`.
 Where `/dev/sda2` is the device you want to create.
+
+## Open an encrypted device
+
+To open and map a device run `cryptsetup -y -v luksFormat /dev/sda1 crypt0` where
+`/dev/sda1` is your encrypted device and `crypt0` is where it will be mapped to
+with `dev/mapper/crypt0`.