diff --git a/project.clj b/project.clj
index a404441..439e6a4 100644
--- a/project.clj
+++ b/project.clj
@@ -1,5 +1,5 @@
-(defproject depo "0.0.5"
+(defproject depo "0.0.6"
   :description "Manage Clojure dependencies easily"
   :url "https://github.com/somecho/depo"
-  :license {:name "Eclipse Public License, v2"
-            :url  "http://www.eclipse.org/legal/epl-v20.html"})
+  :license {:name "Eclipse Public License, v2",
+            :url "http://www.eclipse.org/legal/epl-v20.html"})
diff --git a/src/depo/core.clj b/src/depo/core.clj
index 9d7bfd8..c254e91 100644
--- a/src/depo/core.clj
+++ b/src/depo/core.clj
@@ -4,7 +4,6 @@
             [depo.errors :as e]))
 
 (defn add [{:keys [_arguments file]}]
-  (println file)
   (let [args  _arguments
         config-path (if file file (rw/get-config))]
     (if-not (empty? args)
@@ -18,7 +17,7 @@
 (def CONFIGURATION
   {:command "depo"
    :description "manage Clojure dependencies easily"
-   :version "0.0.5"
+   :version "0.0.6"
    :opts [{:as "path to configuration file"
            :default nil
            :option "file"
diff --git a/src/depo/readwrite.clj b/src/depo/readwrite.clj
index 2b671ab..4461eaa 100644
--- a/src/depo/readwrite.clj
+++ b/src/depo/readwrite.clj
@@ -38,3 +38,40 @@
         (zp/zprint-str {:parse-string? true
                         :map {:sort? false}})
         (as-> new-conf (spit config-path new-conf)))))
+
+(defmethod write-dependency "project.clj"
+  [config-path arg]
+  (let [zloc (z/of-string (slurp config-path))
+        {:keys [groupID artifactID version]} (r/conform-version arg)
+        dep-sym (symbol (if (= groupID artifactID)
+                          artifactID
+                          (str groupID "/" artifactID)))
+        zipper (if (z/find-value zloc z/next :dependencies)
+                 zloc
+                 (-> zloc
+                     (z/append-child :dependencies)
+                     (z/append-child  [])))]
+    (println (str "Adding " groupID "/" artifactID " v" version))
+    (-> zipper
+        (z/find-value z/next :dependencies)
+        (z/right)
+        (z/string)
+        (read-string)
+        (as-> dep-vec
+              (filter #(not= dep-sym (first %)) dep-vec))
+        (vec)
+        (conj [dep-sym version])
+        (as-> new-deps
+              (-> zipper
+                  (z/find-value z/next :dependencies)
+                  (z/right)
+                  (z/replace new-deps)))
+        (as-> veczip
+              (z/map (fn [z] (if (z/rightmost? z)
+                               z
+                               (z/insert-newline-right z))) veczip))
+        (z/root-string)
+        (zp/zprint-str {:parse-string? true
+                        :vector {:respect-nl? true
+                                 :wrap-coll? nil}})
+        (as-> new-conf (spit config-path new-conf)))))