switched "to know to use" to "when using"

mnikliborc · Apr 20, 2014 · bb5d387 · bb5d387
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commit bb5d387
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/outline/functions.md b/outline/functions.md
@@ -58,7 +58,7 @@ Functions that return true or false--called _predicates_--usually end in `?`:
 
 ## Important functions
 
-There are some functions that are essential to know to use Clojure. The arithmetic ones and `str` have already been covered, and you need to know them. Let's look at some others.
+There are some functions that are essential when using Clojure. The arithmetic ones and `str` have already been covered, and you need to know them. Let's look at some others.
 
 ### Comparison functions