diff --git a/functions.sh b/functions.sh
index b8fbe93..1066442 100755
--- a/functions.sh
+++ b/functions.sh
@@ -232,6 +232,7 @@ function pipupdate(){
     done
 }
 
+# unzip file to directory with the same name of the zip file (without extension)
 function unzipd {
     zip_file="$1"
     filename=$(basename -- "$zip_file")
@@ -240,6 +241,12 @@ function unzipd {
     unzip -d "$name" "$zip_file"
 }
 
+# remove local branches which have been merged into master
+function git_prune_branches(){
+    git branch --merged master | grep -v '^[ * ]*master$' | xargs git branch -d
+}
+
+
 # dotfiles user functions
 if [[ -f $HOME/.dotfiles_functions ]]; then
     source "$HOME/.dotfiles_functions"