Thanks This one is more detailed, found it a minute ago.

http://www.economist.com/blogs/economist-explains/2015/01/economist-explains-13

Basics.. Francs value was pushed up by investors seeking a safe haven from volatility
            Franc pegged to euro by quantitative easing to stop rise.
            Extra Francs used to buy Euros for foreign reserves. (helping to prop it up a little I suspect)
            Political panic about hyperinflation and proposed QE of the Euro leads to decision to stop...