clean the ambiguity with insertBack and add a insertBackByOuterInner function
diff --git a/doc/C07_TutorialSparse.dox b/doc/C07_TutorialSparse.dox
index ae96d77..ee8a1a1 100644
--- a/doc/C07_TutorialSparse.dox
+++ b/doc/C07_TutorialSparse.dox
@@ -183,7 +183,7 @@
 }
 mat.finalize();                             // optional for a DynamicSparseMatrix
 \endcode
-
+Note that there also exist the insertBackByOuterInner(Index outer, Index, inner) function which allows to write code agnostic to the storage order.
 
 \section TutorialSparseFeatureSet Supported operators and functions