diff --git a/documentation/current/eiffelstudio/eiffelstudio-reference/compiler/differences-between-standard-ecma-367-and-eiffel-software-implementation.wiki b/documentation/current/eiffelstudio/eiffelstudio-reference/compiler/differences-between-standard-ecma-367-and-eiffel-software-implementation.wiki
index ab7e571d..f03a1acc 100644
--- a/documentation/current/eiffelstudio/eiffelstudio-reference/compiler/differences-between-standard-ecma-367-and-eiffel-software-implementation.wiki
+++ b/documentation/current/eiffelstudio/eiffelstudio-reference/compiler/differences-between-standard-ecma-367-and-eiffel-software-implementation.wiki
@@ -1,6 +1,8 @@
 [[Property:title|Differences between standard ECMA-367 and Eiffel Software implementation]]
 [[Property:weight|-10]]
 [[Property:uuid|0eb58761-5b06-585f-ea92-cab2b8cd74b2]]
+"ETL 2" refers to the book "Eiffel: The Language" (2nd printing), published by Prentice Hall.
+
 ==Kernel classes==
 {| class="doctable"
 |-