Update README.md

README.md

@@ -19,7 +19,11 @@ To add a modifier, include the class you want after the icon name, which looks l
 
 ## Wind Usage
 
-To use the wind indicators, you must also use `weather-icons-wind.min.css` along with the default CSS file.
+To use the wind indicators, you must also use `weather-icons-wind.min.css` along with the default CSS file. To dispay a wind indicator, you must use the base class `wi` and `wi-wind`, and then include the towards/from direction you want, like `from-293-deg`. This ends up looking like . You can use any degree from 0 to 359 in this manner. 
+
+Note: A "from" class has the point of the arrow at the opposite end of the degree. For example, a "from 90 degrees" icon would point to the 270 degree mark, wheras a "towards 270 degrees" would point at the same 270 degree mark.
+
+Included in the set as well are aliases to point to cardinal directions. They work the same as degrees, for example `<i class="wi wi-wind towards-sse"></i>` would be an arrow pointing to the South by Southeast (roughly 158 degrees). 
 
 ## Contributing
 If you feel so inclined to add icon ideas, icon art, or other fixes/changes to how the package works, feel free to help!