diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6c3e94c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "is-wordpress"]
+	path = is-wordpress
+	url = git@github.com:tanrax/is-wordpress.git
diff --git a/calculate-percentage.sh b/calculate-percentage.sh
index d39bf9e..18a9cf3 100644
--- a/calculate-percentage.sh
+++ b/calculate-percentage.sh
@@ -5,4 +5,4 @@ NUM_NOT_WORDPRESS=$(cat $CSV | grep ,false$ | wc -l)
 NUM_TIMEOUT=$(cat $CSV | grep ,timeout$ | wc -l)
 TOTAL=$(cat $CSV | wc -l)
 
-echo "($NUM_WORDPRESS * 100) / ($TOTAL - $NUM_TIMEOUT)" | bc
+echo "($NUM_WORDPRESS * 100) / ($TOTAL - $NUM_TIMEOUT)" | bc | awk '{print $1"%"}'
diff --git a/is-wordpress b/is-wordpress
new file mode 160000
index 0000000..b64770e
--- /dev/null
+++ b/is-wordpress
@@ -0,0 +1 @@
+Subproject commit b64770eb63dcb3924957bed824e79d380089e2c2
diff --git a/src/wordpress_used/core.clj b/src/wordpress_used/core.clj
index 6763b73..45664ce 100644
--- a/src/wordpress_used/core.clj
+++ b/src/wordpress_used/core.clj
@@ -5,10 +5,10 @@
    [clojure.java.shell :as shell]
    ) (:gen-class))
 
-(defn request
-  "Make a request by means of curl"
+(defn wordpress?
+  "Check if a web page is generated with WordPress"
   [url]
-  (shell/sh "curl" "-L" "-m" "5" "-H" "User-Agent: Firefox" url))
+  (= (clojure.string/trim-newline (:out (shell/sh "bash" "./is-wordpress/is-wordpress" url))) "true"))
 
 
 (defn read-csv-domains
@@ -17,11 +17,6 @@
   (with-open [reader (io/reader (io/resource url))]
     (doall (csv/read-csv reader))))
 
-(defn wordpress?
-  "Check if a web page is generated with WordPress"
-  [url]
-  (let [response (request url)]
-    (every? identity [(re-find (re-pattern "meta.*generator.*WordPress") (:out response))])))
 
 (defn -main
   [& args]