diff --git a/pingu/README.md b/pingu/README.md
new file mode 100644
index 0000000..fe5dd49
--- /dev/null
+++ b/pingu/README.md
@@ -0,0 +1,17 @@
+# pingu
+
+## wtf is it?
+
+pingu is a small script that pings several IPv4 given as arguments to check whether they're reachable or not.
+
+## Usage
+
+```sh
+./pingu <IPv4> ...
+```
+
+## The future
+
+Some ideas I have to improve this script:
+- handle IPv6
+- colored output
diff --git a/wgtest b/pingu/pingu
old mode 100644
new mode 100755
similarity index 77%
rename from wgtest
rename to pingu/pingu
index 64373a7..2854c2e
--- a/wgtest
+++ b/pingu/pingu
@@ -1,10 +1,11 @@
 #!/usr/bin/env sh
 
-USAGE="usage : wgtest <IP address> ..."
+USAGE="NOOT NOOT
+USAGE : ./pingu <IP address> ..."
 
 if [ $# -eq 0 ]; then
 	echo "$USAGE"
-	return
+	exit 1
 fi
 
 for host in $@; do