diff --git a/free-programming-books.md b/free-programming-books.md
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+++ b/free-programming-books.md
@@ -2119,6 +2119,7 @@ For resources on Angular, Backbone, D3, Dojo, Ember, Express, jQuery, Knockout,
 * [SQL Server Execution Plans](http://download.red-gate.com/ebooks/SQL/sql-server-execution-plans.pdf) (PDF) *(RedGate, By Grant Fritchey)*
 * [SQL Server Execution Plans, Second Edition](http://download.red-gate.com/ebooks/SQL/eBOOK_SQLServerExecutionPlans_2Ed_G_Fritchey.pdf) (PDF) *(RedGate, By Grant Fritchey)*
 * [SQL Server Hardware](http://www.red-gate.com/community/books/sql-server-hardware) *(RedGate, By Glenn Berry)*
+* [SQL Server Internals: In-Memory OLTP](http://www.red-gate.com/library/sql-server-internals-in-memory-oltp) *(RedGate, By Kalen Delaney)*
 * [SQL Server Statistics](http://www.red-gate.com/community/books/sql-server-statistics) *(RedGate, By Holger Schmeling)*
 * [SQL Server Stumpers Vol.5](http://www.red-gate.com/community/books/sql-server-stumpers-v5) *(RedGate, By SQLServerCentral Authors)*
 * [SQL Server Tacklebox](http://www.red-gate.com/community/books/sql-server-tacklebox) *(RedGate, By Rodney Landrum)*