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--- a/README.markdown
+++ b/README.markdown
@@ -195,6 +195,18 @@ Would return: ['a','c']
- *Type*: rvalue
+difference
+----------
+This function returns the difference between two arrays.
+The returned array is a copy of the original array, removing any items that
+also appear in the second array.
+
+*Examples:*
+
+ difference(["a","b","c"],["b","c","d"])
+
+Would return: ["a"]
+
dirname
-------
Returns the `dirname` of a path.
@@ -416,6 +428,16 @@ Would return: {'a'=>1,'b'=>2,'c'=>3}
- *Type*: rvalue
+intersection
+-----------
+This function returns an array an intersection of two.
+
+*Examples:*
+
+ intersection(["a","b","c"],["b","c","d"])
+
+Would return: ["b","c"]
+
is_array
--------
Returns true if the variable passed to this function is an array.
@@ -868,6 +890,17 @@ Returns the type when passed a variable. Type can be one of:
- *Type*: rvalue
+union
+-----
+This function returns a union of two arrays.
+
+*Examples:*
+
+ union(["a","b","c"],["b","c","d"])
+
+Would return: ["a","b","c","d"]
+
+
unique
------
This function will remove duplicates from strings and arrays.