Much more documentation
diff --git a/doc/intro.rst b/doc/intro.rst
index cc89a19..14d0177 100644
--- a/doc/intro.rst
+++ b/doc/intro.rst
@@ -1,4 +1,4 @@
-Introduction
+Introduction & history
==================================================
Python-RSA's history starts in 2006. As a student assignment for the
@@ -6,7 +6,8 @@
for various reasons; one of the most important reasons was the
`unlimited precision integer`_ support.
-.. _`unlimited precision integer`: http://docs.python.org/library/stdtypes.html#numeric-types-int-float-long-complex
+.. _`unlimited precision integer`:
+ http://docs.python.org/library/stdtypes.html#numeric-types-int-float-long-complex
It started out as just a module for calculating large primes, and RSA
encryption, decryption, signing and verification using those large
@@ -14,6 +15,24 @@
was no functionality for working with byte sequences (such as files)
yet.
-.. todo:: write more history
+Version 1.0 did include support for byte sequences, but quite clunky,
+mostly because it didn't support 0-bytes and thus was unsuitable for
+binary messages.
+
+Version 2.0 introduced a lot of improvements by Barry Mead, but still
+wasn't compatible with other RSA implementations and used no random
+padding.
+
+Version 3.0 introduced PKCS#1 v1.5 functionality, which resulted in
+compatibility with OpenSSL and many others implementing the same
+standard. Random padding was introduced that considerably increased
+security, which also resulted in the ability to encrypt and decrypt
+binary messages.
+
+Key generation was also improved in version 3.0, ensuring that you
+really get the number of bits you asked for. At the same time key
+generation speed was greatly improved. The ability to save and load
+public and private keys in PEM and DER format as also added.
+