diff --git a/advanced/scipy_sparse/introduction.rst b/advanced/scipy_sparse/introduction.rst
index 4aedcae71..c516fde37 100644
--- a/advanced/scipy_sparse/introduction.rst
+++ b/advanced/scipy_sparse/introduction.rst
@@ -53,7 +53,8 @@ Typical Applications
     * mechanical engineering, electrotechnics, physics, ...
 * graph theory
     * nonzero at `(i, j)` means that node `i` is connected to node `j`
-* ...
+* natural language processing
+    * nonzero at `(i, j)` means that the document `i` contents the word `j`
 
 Prerequisites
 -------------