Document the redis-server cli options in the README

README

@@ -62,6 +62,15 @@ parameter (the path of the configuration file):
     % cd src
     % ./redis-server /path/to/redis.conf
 
+It is possible to alter the Redis configuration passing parameters directly
+as options using the command line. Examples:
+
+    % ./redis-server --port 9999 --slaveof 127.0.0.1 6379
+    % ./redis-server /etc/redis/6379.conf --loglevel debug
+
+All the options in redis.conf are also supported as options using the command
+line, with exactly the same name.
+
 Playing with Redis
 ------------------