1 files changed, 35 insertions, 18 deletions
diff --git a/ext/digest/digest.c b/ext/digest/digest.c
index 8cd8f40c85..527d0ed1fe 100644
--- a/ext/digest/digest.c
+++ b/ext/digest/digest.c
@@ -32,37 +32,58 @@ RUBY_EXTERN void Init_digest_base(void);
  *
  * You may want to look at OpenSSL::Digest as it supports more algorithms.
  *
- * A cryptographic hash function is a procedure that takes data and return a
- * fixed bit string : the hash value, also known as _digest_. Hash functions
+ * A cryptographic hash function is a procedure that takes data and returns a
+ * fixed bit string: the hash value, also known as _digest_. Hash functions
  * are also called one-way functions, it is easy to compute a digest from
  * a message, but it is infeasible to generate a message from a digest.
  *
- * == Example
+ * == Examples
  *
  *   require 'digest'
  *
  *   # Compute a complete digest
+ *   Digest::SHA256.digest 'message'       #=> "\xABS\n\x13\xE4Y..."
+ *
  *   sha256 = Digest::SHA256.new
- *   digest = sha256.digest message
+ *   sha256.digest 'message'               #=> "\xABS\n\x13\xE4Y..."
+ *
+ *   # Other encoding formats
+ *   Digest::SHA256.hexdigest 'message'    #=> "ab530a13e459..."
+ *   Digest::SHA256.base64digest 'message' #=> "q1MKE+RZFJgr..."
  *
  *   # Compute digest by chunks
- *   sha256 = Digest::SHA256.new
- *   sha256.update message1
- *   sha256 << message2 # << is an alias for update
+ *   md5 = Digest::MD5.new
+ *   md5.update 'message1'
+ *   md5 << 'message2'                     # << is an alias for update
+ *
+ *   md5.hexdigest                         #=> "94af09c09bb9..."
+ *
+ *   # Compute digest for a file
+ *   sha256 = Digest::SHA256.file 'testfile'
+ *   sha256.hexdigest
  *
- *   digest = sha256.digest
+ * Additionally digests can be encoded in "bubble babble" format as a sequence
+ * of consonants and vowels which is more recognizable and comparable than a
+ * hexadecimal digest.
+ *
+ *   require 'digest/bubblebabble'
+ *
+ *   Digest::SHA256.bubblebabble 'message' #=> "xopoh-fedac-fenyh-..."
+ *
+ * See the bubble babble specification at
+ * http://web.mit.edu/kenta/www/one/bubblebabble/spec/jrtrjwzi/draft-huima-01.txt.
  *
  * == Digest algorithms
  *
- * Different digest algorithms (or hash functions) are available :
+ * Different digest algorithms (or hash functions) are available:
  *
  * HMAC::
- *   See FIPS PUB 198 The Keyed-Hash Message Authentication Code (HMAC)
+ *   See FIPS PUB 198 The Keyed-Hash Message Authentication Code (HMAC).
  * RIPEMD-160::
- *   (as Digest::RMD160) see
- *   http://homes.esat.kuleuven.be/~bosselae/ripemd160.html
+ *   As Digest::RMD160.
+ *   See http://homes.esat.kuleuven.be/~bosselae/ripemd160.html.
  * SHA1::
- *   See FIPS 180 Secure Hash Standard
+ *   See FIPS 180 Secure Hash Standard.
  * SHA2 family::
  *   See FIPS 180 Secure Hash Standard which defines the following algorithms:
  *   * SHA512
@@ -70,11 +91,7 @@ RUBY_EXTERN void Init_digest_base(void);
  *   * SHA256
  *
  * The latest versions of the FIPS publications can be found here:
- * http://csrc.nist.gov/publications/PubsFIPS.html
- *
- * Additionally Digest::BubbleBabble encodes a digest as a sequence of
- * consonants and vowels which is more recognizable and comparable than a
- * hexadecimal digest.  See http://en.wikipedia.org/wiki/Bubblebabble
+ * http://csrc.nist.gov/publications/PubsFIPS.html.
  */
 
 static VALUE