1 files changed, 26 insertions, 1 deletions
diff --git a/ext/fiddle/fiddle.c b/ext/fiddle/fiddle.c
index 06b08639f4..c4b590ca84 100644
--- a/ext/fiddle/fiddle.c
+++ b/ext/fiddle/fiddle.c
@@ -135,9 +135,34 @@ Init_fiddle(void)
     /*
      * Document-module: Fiddle
      *
+     * A libffi wrapper for Ruby.
+     *
      * == Description
      *
-     * A libffi wrapper.
+     * Fiddle is an extension to translate a foreign function interface (FFI)
+     * with ruby.
+     *
+     * It wraps {libffi}[http://sourceware.org/libffi/], a popular C library
+     * which provides a portable interface that allows code written in one
+     * language to clal code written in another language.
+     *
+     * == Example
+     *
+     * Here we will use Fiddle::Function to wrap {floor(3) from
+     * libm}[http://linux.die.net/man/3/floor]
+     *
+     *	    require 'fiddle'
+     *
+     *	    libm = Fiddle.dlopen('/lib/libm.so.6')
+     *
+     *	    floor = Fiddle::Function.new(
+     *	      libm['floor'],
+     *	      [Fiddle::TYPE_DOUBLE],
+     *	      Fiddle::TYPE_DOUBLE
+     *	    )
+     *
+     *	    puts floor.call(3.14159) #=> 3.0
+     *
      *
      */
     mFiddle = rb_define_module("Fiddle");