How to add Wikipedia as a Chrome search engine

For a simple way to add Wikpedia into Chrome as a search engine follow the below steps:

• in Chrome go to Tools menu,
• then Options,
• in the Default Search section click Manage
• click Add and enter the below details in the available fields

Name: Wikipedia
Keyword: wiki
URL: http://en.wikipedia.org/wiki/%s

refer image below:

No in chrome just type wiki followed by where you want, ie wiki php in the chrome address box (refer image below) and chrome will now search wikipedia for that term