diff --git a/README.md b/README.md
index fc1e0e0..8b76a6f 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,19 @@ This package contains the binary firmware for AMD/ATI graphics chips supported b
sudo apt-get update
sudo apt-get install firmware-amd-graphics
```
+
+### Crystal
+
+To install Crystal, you will need to add their apt repository. Their `setup.sh` script helps simplify this.
+
+⚠️ Needs `dirmngr` to get authentication keys
+
+```shell
+curl https://dist.crystal-lang.org/apt/setup.sh | sudo bash
+sudo apt-get install build-essential
+sudo apt-get install crystal
+```
+
### dirmngr
dirmngr is a server for managing and downloading OpenPGP and X.509 certificates, as well as updates and status signals related to those certificates. For OpenPGP, this means pulling from the public HKP/HKPS keyservers, or from LDAP servers. For X.509 this includes Certificate Revocation Lists (CRLs) and Online Certificate Status Protocol updates (OCSP). It is capable of using tor for network access.
@@ -159,7 +172,7 @@ sudo apt update
# Try installing erlang-nox
sudo apt-get install erlang-nox
-# You might get this errors:
+# You might get these errors:
# erlang-nox : Depends: erlang-diameter but it is not going to be installed
# Depends: erlang-eldap but it is not going to be installed
# If you do so, try this:
@@ -175,13 +188,11 @@ RabbitMQ Server should have automatically started by now, but if it is not, run
### _MISC
-Useful Linux commands
-
-
+
+Useful Linux commands
- Information about graphic card:
- `sudo lspci -v -s 01:00.0`
- `inxi -Gx`
- List all shell commands available `compgen -c` (use with `grep`?)
-
-
+