--- htk_3.4.1/HTKBook/HTKRef/HMMIRest.tex	2009-03-11 10:07:33.000000000 +0000
+++ htk_3.4.2/HTKBook/HTKRef/HMMIRest.tex	2009-11-22 15:18:28.421000000 +0000
@@ -243,6 +243,7 @@
 \stdoptM
 
  \ttitem{-Q ext} Set the lattice file extension to {\tt ext}
+\stdoptX
 \end{optlist}
 
 \stdopts{HMMIRest}