diff --git a/README.md b/README.md
index 53c07cc..ae0288c 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,26 @@ You can do this:
     (def version "1.0.0")
     $
 
+## Configuration
+
+If you have your own version tagging scheme, and/or some other way of
+grabbing a version string from your source tree, you can configure
+lein-git-version by adding keys to the :git-version hash-map in your
+project.
+
+The following are the defaults:
+
+    (defproject nifty "bLAH BLaH"
+      ...
+      :git-version {:describe-command ["git" "describe" "--match" 
+                                       "v*.*" "--abbrev=4"
+                                       "--dirty=**DIRTY**"]
+                    :tag->version (fn [tag] (apply str (rest tag)))})
+    
+`describe-command` is a shell command that should print the current
+tag, and `tag->version` is a function that translates the tag into a
+version string.
+
 ## License
 
 Copyright © 2012 Colin Steele
diff --git a/src/lein_git_version/plugin.clj b/src/lein_git_version/plugin.clj
index 35b2a58..902cdd5 100644
--- a/src/lein_git_version/plugin.clj
+++ b/src/lein_git_version/plugin.clj
@@ -5,12 +5,13 @@
 
 (defn middleware
   [project]
-  (let [code (str
+  (let [version (get-git-version (:git-version project))
+        code (str
               ";; Do not edit.  Generated by lein-git-version plugin.\n"
               "(ns " (:name project) ".version)\n"
-              "(def version \"" (get-git-version) "\")\n")
+              "(def version \"" version "\")\n")
         filename (str (first (:source-paths project)) "/"
                       (:name project) "/version.clj")]
     (-> project
         (update-in [:injections] concat `[(spit ~filename ~code)])
-        (assoc :version (get-git-version)))))
+        (assoc :version version))))
diff --git a/src/leiningen/git_version.clj b/src/leiningen/git_version.clj
index 4af74db..54b1377 100644
--- a/src/leiningen/git_version.clj
+++ b/src/leiningen/git_version.clj
@@ -5,19 +5,22 @@
             [leiningen.core.main]
             [leiningen.core.project]
             [robert.hooke]
-            [leiningen.test])
+            [leiningen.test]
+            [clojure.string :as str])
   (:use
    [clojure.java.shell :only [sh]]))
 
+(def defaults
+  {:describe-command  ["git" "describe" "--match" "v*.*"
+                      "--abbrev=4" "--dirty=**DIRTY**"]
+   :tag->version '(fn [tag] (apply str (rest tag)))})
+
 (defn get-git-version
-  []
-  (apply str (rest (clojure.string/trim
-                    (:out (sh
-                           "git" "describe" "--match" "v*.*"
-                           "--abbrev=4" "--dirty=**DIRTY**"))))))
+  [& [config]]
+  (let [{:keys [tag->version describe-command]} (merge defaults config)]
+    ((eval tag->version) (str/trim (:out (apply sh describe-command))))))
 
 (defn git-version
-  "Main project task."
-  ^{:doc "Show git project version"}
+  "Show git project version"
   [project & args]
-  (println (get-git-version)))
+  (println (get-git-version (:git-version project))))