Update README.md

README.md

@@ -9,9 +9,13 @@ Personal Arch Linux package repository.
 
 ## Usage <a name="usage"></a>
 
-199980CE93F18E62
+First, you need to locally sign my PGP key:
 
-Add 
+```
+sudo pacman-key --lsign-key 199980CE93F18E62
+```
+
+Then, add
 
 ```bash
 [calrepo]
@@ -21,6 +25,14 @@ Server = https://slococo.com.ar/$repo/$arch
 
 to the end of `/etc/pacman.conf`.
 
+Finally, you must sync the repositories:
+
+```
+sudo pacman -Sy
+```
+
+Now you can install any of the packages from the `calrepo` repo.
+
 ## Contributing <a name="contributing"></a>
 PRs are welcome.