diff --git a/build-aux/texinfo.tex b/build-aux/texinfo.tex
index 2b7b31b34..77f8383f4 100644
--- a/build-aux/texinfo.tex
+++ b/build-aux/texinfo.tex
@@ -33,7 +33,7 @@
 % The texinfo.tex in any given distribution could well be out
 % of date, so if that's what you're using, please check.
 %
-% Send bug reports to address@hidden.  Please include including a
+% Send bug reports to address@hidden.  Please include a
 % complete document in each bug report with which we can reproduce the
 % problem.  Patches are, of course, greatly appreciated.
 %
@@ -10725,6 +10725,8 @@ directory should work if nowhere else does.}
   \DeclareUnicodeCharacter{0233}{\=y}%
   \DeclareUnicodeCharacter{0237}{\dotless{j}}%
   %
+  \DeclareUnicodeCharacter{02BC}{'}%
+  %
   \DeclareUnicodeCharacter{02DB}{\ogonek{ }}%
   %
   % Greek letters upper case