diff --git a/tutos/computer.txt b/tutos/computer.txt
index d6470a5..77397c9 100644
--- a/tutos/computer.txt
+++ b/tutos/computer.txt
@@ -34,6 +34,14 @@
 				sed 's/^BASEURL=/URL=/' "$1" | grep -m 1 '^URL=' | sed 's/^URL=//' | sed 's/\r//' | xargs xdg-open
 			fi
 		```
+	- signification :
+		- for the command "open_url file.URL" :
+			- **$0**                      : /usr/local/bin/open_url
+			- **$(basename "$0")**        : open_url
+			- **$1**                      : file.URL
+		- the sed command :
+			- **grep -m 1** : tells grep to stop searching after the first match
+			- **xargs**     : reads items from standard input and executes a command with those items as arguments
 	- give execution permission : `chmod +x /usr/local/bin/open_url`
 	- tell the file manager to use this script to open .URL files :
 		- right click on a .URL file
@@ -42,10 +50,18 @@
 		- 'use as default for this kind of file' (or equivalent)
 		- open :)
 
+
 **open .webloc files :**
 	- see above 'open .URL files'
-	- change this line in the script :
-			grep -m 1 -oP '(?<=<string>).*?(?=<\/string>)' repas_4_etoiles.webloc | xargs xdg-open
+	- in the script change the line "sed..." by this :
+			grep -m 1 -oP '(?<=<string>).*?(?=<\/string>)' "$1" | xargs xdg-open
+	- signification :
+		- **-m 1**          : tells grep to stop searching after the first match
+		- **-o**            : tells grep to print only the matching portion of the line
+		- **-P**            : this option enables Perl-compatible regular expressions, which support lookaheads and lookbehinds
+		- **(?<=<string>)** : this is a positive lookbehind that matches the position immediately after <string>.
+		- **.*?**           : this matches any character (except for a newline) zero or more times, but as few times as possible.
+		- **(?=<\/string>)** : this is a positive lookahead that matches the position immediately before </string>
 
 
 **pdftotext** transforme un pdf en un fichier texte
@@ -227,7 +243,7 @@ find | sort | grep -ve "node_modules/" -e ".git/" | sed 's#[^/]*/#|__ #g;s#__ |#
 
 
 **list of automatic settings :**
-	- install screen, omyzsh, keepassxc, curl, make, firefox, signal, gnome-tweaks
+	- install screen, omyzsh, keepassxc, curl, make, firefox, signal, gnome-tweaks, ffmpeg, yt-dlp
 	- install or configure to avoid screen blue light
 	- install nextcloud client (apt ? or appimage ? appimage need fuse : https://github.com/AppImage/AppImageKit/wiki/FUSE), and launch at startup
 	- install these settings (connection with bitbucket ? ssh ? https ?)
diff --git a/tutos/vim.txt b/tutos/vim.txt
index 600b669..32695e6 100644
--- a/tutos/vim.txt
+++ b/tutos/vim.txt
@@ -137,7 +137,7 @@
 **==** rétablit la bonne indentation pour la ligne
 **=G** rétablit la bonne indentation pour toute la page
 **''** go to last cursor position
-**gx** open the file under cursor, or url
+**gx** open the file under cursor, or url or links
 
 /REMPLACER/
 **:s/old/new** remplace la 1ere occurence de ancien par nouveau