1 files changed, 39 insertions, 3 deletions
diff --git a/ext/coverage/coverage.c b/ext/coverage/coverage.c
index a56a408665..b40b28bc21 100644
--- a/ext/coverage/coverage.c
+++ b/ext/coverage/coverage.c
@@ -1,11 +1,47 @@
+/************************************************
+
+  coverage.c -
+
+  $Author: $
+
+  Copyright (c) 2008 Yusuke Endoh
+
+************************************************/
+
 #include "ruby.h"
 
-VALUE rb_mCoverage;
+extern void rb_enable_coverages(void);
 
+/* Coverage provides coverage measurement feature for Ruby.
+ *
+ * = Usage
+ *
+ * (1) require "coverage.so"
+ * (2) require or load Ruby source file
+ * (3) Coverage.result will return a hash that contains filename as key and
+ *     coverage array as value.
+ *
+ * = Example
+ *
+ *   [foo.rb]
+ *   s = 0
+ *   10.times do |x|
+ *     s += x
+ *   end
+ *
+ *   if s == 45
+ *     p :ok
+ *   else
+ *     p :ng
+ *   end
+ *   [EOF]
+ *
+ *   require "coverage.so"
+ *   require "foo.rb"
+ *   p COVERAGE__  #=> {"foo.rb"=>[1, 1, 10, nil, nil, 1, 1, nil, 0, nil]}
+ */
 void
 Init_coverage(void)
 {
     rb_enable_coverages();
-    rb_mCoverage = rb_define_module("Coverage");
-    rb_define_module_function(rb_mCoverage, "result", rb_get_coverages, 0);
 }