diff --git a/escape.gemspec b/escape.gemspec
new file mode 100644
index 0000000..bbac06c
--- /dev/null
+++ b/escape.gemspec
@@ -0,0 +1,20 @@
+require "./lib/escape"
+
+Gem::Specification.new do |s|
+  s.name              = "escape"
+  s.version           = Escape::VERSION
+  s.summary           = "escape library"
+  s.description       = "escape library provides several HTML/URI/shell escaping functions."
+  s.authors           = ["Tanaka Akira"]
+  s.email             = ["akr@fsij.org"]
+  s.homepage          = "http://github.com/akr/escape"
+
+  s.files = Dir[
+    "ChangeLog",
+    "README",
+    "lib/**/*.rb",
+    "*.gemspec",
+    "test/**/*.*"
+  ]
+
+end
diff --git a/escape.rb b/lib/escape.rb
similarity index 99%
rename from escape.rb
rename to lib/escape.rb
index e3536f4..a794ee3 100644
--- a/escape.rb
+++ b/lib/escape.rb
@@ -30,6 +30,7 @@
 # * shell command
 # * MIME parameter
 module Escape
+  VERSION = "0.3"
   module_function
 
   class StringWrapper