Updated readme with some further directions.

README.md

@@ -20,11 +20,11 @@ As ems:
 As px:
 `$("#content p").minLineHeight("13px")`
 
-If the amount is passed as a float or any units other than px, the script will default to ems.
+If the amount is passed as a float or any units other than px, the script will default to ems. In order for min-line-height to take effect an element must have a min-width, max-width, and default line-height (serves as the max-line-height) specified in CSS. Any element without one of the three properties will simply not get processed.
 
 # Why you can't use custom CSS properties to handle this:
 
-Ideally, specifying them min-line-height in a CSS file would be the most manageable way of maintaining the min-line-height property, but Research found that per the CSS 2.1 spec the web browser ignores any property it doesn't recognize:
+Ideally, specifying them min-line-height in a CSS file would be the more manageable, but research found that per the CSS 2.1 mandates browsers to ignore any unrecognized properties:
 
 http://stackoverflow.com/questions/9143501/is-it-possible-to-utilize-a-custom-css-properties-with-javascript/9143684#9143684