rotation_table.md

@@ -73,3 +73,8 @@ To transform both the direction vector ![alt text](http://mathurl.com/jm7yc4a.pn
 ![alt text](http://mathurl.com/zpcvd9v.png),
 
 where we replace ![alt text](http://mathurl.com/z29b7za.png) with ![alt text](http://mathurl.com/jm7yc4a.png) or ![alt text](http://mathurl.com/hrfjerk.png).
+
+
+## Rotating slice
+
+We use the rotation about arbitrary axis described [here](https://sites.google.com/site/glennmurray/Home/rotation-matrices-and-formulas). 
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