diff --git a/source/faq/fundamentals.txt b/source/faq/fundamentals.txt
index 41b92cecadf..1a9f8e9be00 100644
--- a/source/faq/fundamentals.txt
+++ b/source/faq/fundamentals.txt
@@ -135,6 +135,21 @@ in RAM, MongoDB serves all queries from memory.
 MongoDB does not implement a query cache: MongoDB serves all queries
 directly from the indexes and/or data files.
 
+Does MongoDB require a separate caching layer for application-level caching?
+----------------------------------------------------------------------------
+
+No. In MongoDB, a document's representation in the database is similar
+to its representation in application memory. This means the database
+already stores the usable form of data, making the data usable in both
+the persistent store and in the application cache. This eliminates the
+need for a separate caching layer in the application.
+
+This differs from relational databases, where caching data is more
+expensive. Relational databases must transform data into object
+representations that applications can read and must store the
+transformed data in a separate cache. If joins are required that adds to
+the overhead.
+
 What language is MongoDB written in?
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