docs/12-arbre-components.md in activeadmin-1.0.0.pre2 vs docs/12-arbre-components.md in activeadmin-1.0.0.pre3

@@ -54,10 +54,10 @@
 need to do is define the number of columns and the component will take care of
 the rest.
 
 #### Simple Columns
 
-To create simple columnns, use the `columns` method. Within the block, call
+To create simple columns, use the `columns` method. Within the block, call
 the #column method to create a new column.
 
 ```ruby
 columns do
   column do