I need a simple and effective way by which I can let my users know that a particular column in a table has more information attached to it when you hover over it. It is not a link, just text (a number more specifically). When you hover over it, it shows you more information attached to that number as a tool tip text.
Any ideas on how to solve this usability problem? I do not want to stick a 'more info' icon on every row of data.