diff --git a/.bashrc b/.bashrc
index 666477c..a705139 100644
--- a/.bashrc
+++ b/.bashrc
@@ -231,7 +231,20 @@ gitdelbranch() {
 }
 
 gitopendiffs() {
-  vim -p `git diff --name-only origin/master | sed 's/src\///g'`
+  myhelp() {
+    echo 'This tool is usefull to open in vim the diff with a branch and a branch in origin'
+    echo 'Before to launch place in the repository'
+  }
+  if [ "$1" == '-h' ]; then
+    myhelp
+    return 1
+  fi
+  if [ $1 == '']; then
+    branch='master'
+  else
+    branch=$1
+  fi
+  vim -p `git diff --name-only 'origin/'$branch | sed 's/src\///g'`
 }
 
 export PATH=~/bin/:$PATH