diff --git a/content/cheat sheets/git-fr.md b/content/cheat sheets/git-fr.md
index 4391f4b..0a36b50 100644
--- a/content/cheat sheets/git-fr.md	
+++ b/content/cheat sheets/git-fr.md	
@@ -1,7 +1,7 @@
 ---
 Title: Quelques astuces git
 Date: 2019-04-22 17:00
-Modified: 2019-04-24 14:27+05:30
+Modified: 2019-04-24 20:08+05:30
 Author: Fabrice
 Category: cheat sheets
 Tags: git, termtosvg
@@ -44,6 +44,11 @@ Pour ajouter un changement atomique dans un fichier (de manière interactive):
 ```sh
 git add -p <file>
 ```
+**Unsafe:** pour réécrire le passé en supprimant un fichier (par exemple si on a commité un donnée *sensible*):
+```sh
+git filter-branch --prune-empty --tree-filter "rm -f '<fichier>'" HEAD
+git push --force
+```
 
 Une autre astuce utile : `git commit -v`, qui permet de réviser nos changements avant de commiter.
 Une image vaut mieux que mille mots :
diff --git a/content/cheat sheets/git.md b/content/cheat sheets/git.md
index cb443d6..8f90002 100644
--- a/content/cheat sheets/git.md	
+++ b/content/cheat sheets/git.md	
@@ -1,7 +1,7 @@
 ---
 Title: Some git tricks
 Date: 2019-04-22 17:00
-Modified: 2019-04-24 14:27+05:30
+Modified: 2019-04-24 20:08+05:30
 Author: Fabrice
 Category: cheat sheets
 Tags: git, termtosvg
@@ -42,6 +42,12 @@ To add changes in an atomic fashion on a file (in an interactive way):
 git add -p <file>
 ```
 
+**Unsafe:** to remove a file from the past (for instance when you commit some *sensitive* file):
+```sh
+git filter-branch --prune-empty --tree-filter "rm -f '<file name>'" HEAD
+git push --force
+```
+
 Another useful trick is `git commit -v`, it allows reviewing your changes before committing.
 
 <object data="/examples/git-cv.svg" width="100%">Use of git commit -v</object>