chore: update README.md

README.md

@@ -22,3 +22,39 @@ This repository features my [GNU Guix](https://guix.gnu.org/) configuration and
 
 ### and some (not too impressive) [guile modules](https://codeberg.org/anemofilia/radix/src/branch/main/modules/radix)
 
+## Usage
+To update Radix along with Guix via guix pull, write the following definition to ~/.config/guix/channels.scm,
+
+```scheme
+(channel
+  (name 'radix)
+  (url "https://codeberg.org/anemofilia/radix.git")
+  (branch "main")
+  (introduction
+    (make-channel-introduction
+      "85d30480a1907539855fedee6e6a02362e1895ba"
+      (openpgp-fingerprint
+        "99D0 38B0 CC2F 7356 34D0  82F3 5A8F 3D62 C87A 2B33"))))
+```
+
+for example:
+
+```scheme
+;; ~/.config/guix/channels.scm
+(cons (channel
+       (name 'radix)
+       (url "https://codeberg.org/anemofilia/radix.git")
+       (branch "main")
+       (introduction
+        (make-channel-introduction
+         "85d30480a1907539855fedee6e6a02362e1895ba"
+         (openpgp-fingerprint
+          "99D0 38B0 CC2F 7356 34D0  82F3 5A8F 3D62 C87A 2B33"))))
+       %default-channels)
+;; channels.scm ends here.
+```
+If you are a [Guix Home](https://guix.gnu.org/en/manual/devel/en/html_node/Home-Configuration.html) user, check out the home-channels-service-type.
+
+## Consider also visiting these channels
+- [Hako - Rosenthal](https://codeberg.org/hako/Rosenthal)
+- [Akagi - Guix channel](https://git.sr.ht/~akagi/guixrc)