diff --git a/free-programming-books.md b/free-programming-books.md
index 3694a112..b82f658f 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -200,6 +200,7 @@
 * [Swift](#swift)
   * [Vapor](#vapor)
 * [Tcl](#tcl)
+* [TEI](#tei)
 * [Teradata](#teradata)
 * [Tizen](#tizen)
 * [TLA](#tla)
@@ -2517,6 +2518,11 @@ Kerridge (PDF) (email address *requested*, not required)
 * [TclWise](http://www.invece.org/tclwise/index.html) - Salvatore Sanfilippo
 
 
+### TEI
+
+* [What is the Text Encoding Initiative?](https://books.openedition.org/oep/426) - Lou Bernard
+
+
 ### Teradata
 
 * [Teradata Books](http://www.info.teradata.com)