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+Presto: A project to add delta rpm support into yum for Fedora users
+http://hosted.fedoraproject.org/projects/presto.  A list of presto-enabled
+repositories is available there.
+
+Installation:
+=============
+1- Install yum-presto on your system (yum -y install yum-presto)
+2- Either use a repository that already has presto enabled in it or modify
+   your .repo files so they contain the following:
+     deltaurl = http://your-presto-repository.com
+   where your-presto-repository.com is replaced with a valid presto repository
+3- Now install an old rpm from a presto-enabled repository using rpm, then
+   try updating it using yum. The plugin should kick in, try to download the
+   drpm, reconstruct the full rpm, and yum should install that.
+
+Notes:
+======
+Presto will read the deltaurl from two possible locations:
+1. The repository's .repo file ("deltaurl = http://your-presto-repository.com")
+2. Appended to /etc/yum/pluginconf.d/presto.conf in the form:
+   [repository]
+   deltaurl = http://your-presto-repository.com
+
+Presto.conf has the following options in [main]:
+keepdeltas=1               Always keep deltas in cache no matter what keepcache
+                           is set to.
+neverkeepdeltas=1          Always remove deltas after creating full rpms.
+exitondownloadfailure=0|1  If there is a problem downloading the deltarpm, exit
+                           rather than trying to download the full rpm.
+Note: If you specify neither keepdeltas nor neverkeepdeltas, presto will follow
+      the keepcache option in yum.conf.