diff --git a/README.md b/README.md
index 9be1177..5d82a7d 100644
--- a/README.md
+++ b/README.md
@@ -16,3 +16,21 @@ doas nixos-rebuild switch --flake ".#mrmeeseeks"
 nix flake update
 doas nixos-rebuild switch --flake ".#mrmeeseeks"
 ```
+
+## Update manual packages from github
+
+Somes of module use `fetchFromGithub` who need *SHA-256* hash to meet
+reproductibility. Theses hashed can be obtain with `nix-prefetch-github`:
+
+```shell
+$ nix-shell -p nix-prefetch-github
+$ nix-prefetch-ghithub --rev v1.22.0 sindresorhus pure
+{
+    "owner": "sindresorhus",
+    "repo": "pure",
+    "rev": "87e6f5dd4c793f6d980532205aaefe196780606f",
+    "sha256": "TR4CyBZ+KoZRs9XDmWE5lJuUXXU1J8E2Z63nt+FS+5w="
+}
+```
+
+In this example whe have obtained the hash for the specific 1.22.0 version.
diff --git a/modules/home-manager/cli/vifm/files/vifmrc b/modules/home-manager/cli/vifm/files/vifmrc
index d946abf..cb0a727 100644
--- a/modules/home-manager/cli/vifm/files/vifmrc
+++ b/modules/home-manager/cli/vifm/files/vifmrc
@@ -173,7 +173,8 @@ fileviewer {*.pdf},<application/pdf> pdftotext -nopgbrk %c -
 filetype {*.pdf},<application/pdf>
        \ xdg-open
 fileviewer {*.bmp,*.jpg,*.jpeg,*.png,*.gif,*.xpm},<image/*>
-       \ chafa -f sixel -s %pwx%ph %c:p %pd %N 2>/dev/null
+       \ chafa -f sixel --polite on -s %pwx%ph --animate off %c 
+       \ %pd %N
 filetype {*.bmp,*.jpg,*.jpeg,*.png,*.gif,*.xpm},<image/*>
        \ xdg-open
 fileviewer *.zip,*.jar,*.war,*.ear,*.oxt tar -tf %f