1 files changed, 20 insertions, 0 deletions
diff --git a/ext/digest/md5/md5init.c b/ext/digest/md5/md5init.c
index a6afedef69..41f966fa7b 100644
--- a/ext/digest/md5/md5init.c
+++ b/ext/digest/md5/md5init.c
@@ -22,9 +22,29 @@ static const rb_digest_metadata_t md5 = {
 };
 
 /*
+ * Document-class: Digest::MD5 < Digest::Base
  * A class for calculating message digests using the MD5
  * Message-Digest Algorithm by RSA Data Security, Inc., described in
  * RFC1321.
+ *
+ * MD5 calculates a digest of 128 bits (16 bytes).
+ *
+ * == Examples
+ *  require 'digest'
+ *  
+ *  # Compute a complete digest
+ *  Digest::MD5.hexdigest 'abc'      #=> "90015098..."
+ *
+ *  # Compute digest by chunks
+ *  md5 = Digest::MD5.new               # =>#<Digest::MD5>
+ *  md5.update "ab"
+ *  md5 << "c"                           # alias for #update
+ *  md5.hexdigest                        # => "90015098..."
+ *
+ *  # Use the same object to compute another digest
+ *  md5.reset
+ *  md5 << "message"
+ *  md5.hexdigest                        # => "c13557f2..."
  */
 void
 Init_md5(void)