diff --git a/lib/layouts/aastex63.layout b/lib/layouts/aastex63.layout
index 3af56ec6a4..e2438986d7 100644
--- a/lib/layouts/aastex63.layout
+++ b/lib/layouts/aastex63.layout
@@ -1,5 +1,5 @@
 #% Do not delete the line below; configure depends on this
-#\DeclareLaTeXClass[aastex631,amssymb.sty,latexsym.sty,natbib.sty,verbatim.sty]{American Astronomical Society (AASTeX v. 6.31)}
+#\DeclareLaTeXClass[aastex631,amssymb.sty,latexsym.sty,natbib.sty,verbatim.sty]{American Astronomical Society (AASTeX v. 6.3.1)}
 #  \DeclareCategory{Articles}
 #
 # LyX support for the AAS TeX package http://www.ctan.org/pkg/aastex