diff --git a/ChangeLog b/ChangeLog
index f13ab1b20b18394183b5f60a7f9e7675ea2bf6e4..9aaa781f4645628059a66b45f555b4e3e801bf3c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2010-04-18  Per Cederqvist  <ceder@lysator.liu.se>
+
+	Texinfo syntax compatibility.
+	* doc/Protocol-A.texi: Don't use "@begin tex" instead of "@tex".
+	That construct worked in texinfo.tex version 2003-11-16.09, but
+	support was removed in 2003-11-29.14.
+
 2010-03-31  Per Cederqvist  <ceder@lysator.liu.se>
 
 	Avoid an eternal loop in the test suite.
diff --git a/doc/lyskomd.texi b/doc/lyskomd.texi
index ed31b400b9a6539541a20aa1c5d70bab248c3bba..23c1150b14889b0db59ca4b1581871890a89251d 100644
--- a/doc/lyskomd.texi
+++ b/doc/lyskomd.texi
@@ -9,7 +9,7 @@
 
 @iftex
 @parindent 0pt
-@begin tex
+@tex
 \global\def\BB#1{\b{#1}}
 \global\def\II#1{\i{#1}}
 @end tex