diff --git a/documentation/current/eiffelstudio/eiffelstudio-reference/compiler/differences-between-etl-2nd-printing-and-eiffel-software-implementation.wiki b/documentation/current/eiffelstudio/eiffelstudio-reference/compiler/differences-between-etl-2nd-printing-and-eiffel-software-implementation.wiki
index cc20081e..6d7bbd85 100644
--- a/documentation/current/eiffelstudio/eiffelstudio-reference/compiler/differences-between-etl-2nd-printing-and-eiffel-software-implementation.wiki
+++ b/documentation/current/eiffelstudio/eiffelstudio-reference/compiler/differences-between-etl-2nd-printing-and-eiffel-software-implementation.wiki
@@ -4,6 +4,8 @@
 [[Property:uuid|fc1e73f4-5646-aa41-e7fe-97dc6f3ceb04]]
 {{seealso|See also: [[Differences between standard ECMA-367 and Eiffel Software implementation|Differences between standard ECMA-367 and Eiffel Software implementation]]  }}
 
+"ETL 2nd printing" refers to the book "Eiffel: The Language" (2nd printing), published by Prentice Hall.
+
 ==Added classes==
 * New basic classes have been added: <eiffel>INTEGER_8</eiffel>, <eiffel>INTEGER_16</eiffel>, <eiffel>INTEGER_64</eiffel> and <eiffel>WIDE_CHARACTER</eiffel>.{{seealso|[[Differences between standard ECMA-367 and Eiffel Software implementation|Differences between standard ECMA-367 and Eiffel Software implementation]]  }}