diff --git a/jitsi.logo/README.md b/jitsi.logo/README.md
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+# logo hadoly pour jitsi
+Pour personnaliser un minimum jitsi à la mode Hadoly, il y a trois fichiers images à modifier
+* *favicon.ico* type .ico au format «microsoft»
+* *apple-touch-icon.png* type .png pour les périphériques apple machin truc
+* *watermark.svg* type .svg
+
+## la watermark
+`watermark.svg` est le fichier de l'image affichée en haut à gauche par le css jitsi. Les développeurs de Jitsi demande gentiment à ce que la watermark soit conservée. Un entredeux est de modifier ce fichier en y substituant le logo hadoly.
+Pour cela, rien de mieux que d'utiliser `inkscape`, le meilleur des logiciels libres pour manipuler des fichiers de type `.svg`. Attention, il faut penser à exporter le fichier en écrasant les calques.
+## apple-touch-icon
+apple-touch-icon est une image au format `.png` en 90ppp ou 96ppp, c'est à dire le format par défaut du web.
+Une image de 180x180 pixel est créé à partir du fichier `.svg` source de notre logo grâce encore à `inkscape`. Un fond blanc est ajouté. Le logo est centré, puis réduit au dimension 160x160. Le tout est exporté au format `.png` et 96ppp.
+## favicon.ico
+Il s'agit là d'une survivance d'un passé ou internet explorer était le navigateur imposé par Microsoft. À priori, le favicon, c'est à dire l'imagette affiché dans l'onglet de la fenêtre affichant le site visité, n'a plus nécessité à respecter le standard imposé par Microsoft. Pour malgré tout créé un favicon au format «microsoft», il y a un petit outil encore présent dans nos distribution linux favorite. Il s'agit du paquet `icoutils`.
+Une favicon est une image de 32x32px. Il n'y a rien de plus facile que de créer un fichier `favicon.ico.png` de 32x32px à partir de notre logo et d'`inkscape`. Puis de le transformer avec cette commande :
+```bash
+$icotool -o favicon.ico -c favicon.ico.png 
+
+```
+## installation
+À priori, il suffit de remplacer les trois images présentes dans le dossier `jitsi-meet/images` pour personnaliser notre instance jitsi. En vidant le cache de son navigateur ou en forçant le chargement, la personnalisation de notre instance devrait apparaître avec magie.
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diff --git a/jitsi.logo/watermark.hadoly.svg b/jitsi.logo/watermark.hadoly.svg
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