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diff --git a/docs/programming-guide.md b/docs/programming-guide.md
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@@ -549,7 +549,7 @@ returning only its answer to the driver program.
If we also wanted to use `lineLengths` again later, we could add:
{% highlight java %}
-lineLengths.persist();
+lineLengths.persist(StorageLevel.MEMORY_ONLY());
{% endhighlight %}
before the `reduce`, which would cause `lineLengths` to be saved in memory after the first time it is computed.