diff --git a/README.md b/README.md
index 395dae1..d26f357 100644
--- a/README.md
+++ b/README.md
@@ -8,3 +8,6 @@ Usage: csc [OPTION]... [COMMAND]
     -v  enable verbose mode
     -c  specify config dir, default is /$HOME/.config/csc
     -u  specify user, default is $USER
+    -g  specify hosts group
+    
+Host group file must exists under config dir, one host per line
diff --git a/csc b/csc
index 571afba..ae1af95 100755
--- a/csc
+++ b/csc
@@ -8,6 +8,7 @@
 # -v    enable verbose mode
 # -c    specify config dir, default is $HOME/.config/csc
 # -u    specify user, default is $USER
+# -g    specify hosts group
 
 # defaults
 verbose=false
@@ -15,7 +16,7 @@ confdir="$HOME/.config/csc"
 user=$USER
 
 # get options
-while getopts ":vc:u:" opt; do
+while getopts ":vc:u:g:" opt; do
     case $opt in
         v)
             verbose=true
@@ -26,6 +27,9 @@ while getopts ":vc:u:" opt; do
         u)
             user=$OPTARG
             ;;
+        g)
+            group=$OPTARG
+            ;;
         \?)
             echo "Invalid option: -$OPTARG" >&2
             exit 1
@@ -40,14 +44,6 @@ done
 # clean $@ of options
 shift $((OPTIND-1))
 
-hosts="$confdir/hosts"
-
-if [ ! -e "$hosts" ]
-then
-    echo "Error: hosts file do not exists !"
-    exit
-fi
-
 cmd=$@
 
 if [ -z "$cmd" ]
@@ -57,9 +53,30 @@ then
     echo "  -v  enable verbose mode"
     echo "  -c  specify config dir, default is $HOME/.config/csc"
     echo "  -u  specify user, default is $USER"
+    echo "  -g  specify group"
     exit 1
 fi
 
+if [ -z "$user" ]
+then
+    echo "Error: user is not defined !"
+    exit
+fi
+
+if [ -z "$group" ]
+then
+    echo "Error: group is not defined !"
+    exit
+fi
+
+hosts="$confdir/$group"
+
+if [ -z "$hosts" ]
+then
+    echo "Error: hosts file $confdir/$group do not exists !"
+    exit
+fi
+
 # see http://askubuntu.com/questions/506158/unable-to-initialize-frontend-dialog-when-using-ssh
 #FRONTEND="DEBIAN_FRONTEND=noninteractive" # then you should use clush instead :)
 FRONTEND="TERM=$TERM DEBIAN_FRONTEND=dialog"