diff --git a/README.md b/README.md
index df204a8..3612c40 100644
--- a/README.md
+++ b/README.md
@@ -22,11 +22,11 @@
 	- `history` **? the command history ?**
 	- `binaries` *fetch and launch the right executable*
 	- `'` `"` `;` `\` **? don't interpret special characters and unclosed quotes ?**
-- **pipes :**
+- **pipes :** [video vulgarisation](https://www.youtube.com/watch?v=bKzonnwoR2I)
 	- `|` *pipes*
 - **expensions :**
 	- `$` *variable expension*
-	- `$?` *exit return of last executed process*
+	- `$?` *exit return of last executed process* [ressource stackoverflow](https://stackoverflow.com/questions/7248031/meaning-of-dollar-question-mark-in-shell-scripts)
 - **quotes :** [ressource](https://linuxhandbook.com/quotes-in-bash/)
 	- `'`  *(ignore any special characters)*
 	- `"`  *(ignore any special characters except '$')*
@@ -50,6 +50,9 @@
 	- `env`
 	- ~~`echo`~~
 	- `echo -n`
+- **autres :**
+	- `termcap` [man](https://www.gnu.org/software/termutils/manual/termcap-1.3/html_chapter/termcap_toc.html)
+	- `readline` [man](https://tiswww.case.edu/php/chet/readline/rltop.html) / [second source](https://tiswww.case.edu/php/chet/readline/README)
 
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