diff --git a/yatexmth.el b/yatexmth.el
index c947b53..33ec2af 100644
--- a/yatexmth.el
+++ b/yatexmth.el
@@ -1,7 +1,7 @@
 ;;; yatexmth.el --- YaTeX math-mode-specific functions
 ;;; 
 ;;; (c)1993-2013 by HIROSE Yuuji [yuuji@yatex.org]
-;;; Last modified Mon Apr  1 22:44:22 2013 on firestorm
+;;; Last modified Fri Jul  5 23:28:28 2013 on firestorm
 ;;; $Id$
 
 ;;; Commentary:
@@ -310,6 +310,8 @@
    ("[]"	"Box"		"[]")
    ("no"	"notag"		"\\notag")
    (":"		"colon"		":")
+   (".'."	"therefore"	(".'." "��"))
+   ("'.'"	"because"	("'.'" "��"))
    ("Diamond"	"Diamond"	"/\\\n\\/")
    ("3"		"triangle"	"/\\\n~~")
    ("C"		"clubsuit"	" o\no+o\n |")
diff --git a/yatexpkg.el b/yatexpkg.el
index 47afa46..16c3647 100644
--- a/yatexpkg.el
+++ b/yatexpkg.el
@@ -1,7 +1,7 @@
 ;;; yatexpkg.el --- YaTeX package manager
 ;;; 
 ;;; (c)2003-2013 by HIROSE, Yuuji [yuuji@yatex.org]
-;;; Last modified Tue May  7 09:55:01 2013 on firestorm
+;;; Last modified Fri Jul  5 23:30:48 2013 on firestorm
 ;;; $Id$
 
 ;;; Code:
@@ -32,7 +32,7 @@
     ("amsmath"	(env . YaTeX-package-ams-envs)
      		(section "tag" "tag*"))
     ("amssymb"	(maketitle "leqq" "geqq" "mathbb" "mathfrak"
-			   "fallingdotseq"
+			   "fallingdotseq" "therefore" "because"
 			   "lll" "ggg")) ;very few.  Please tell us!
     ("graphicx" (section "includegraphics"
 			 "rotatebox" "scalebox" "resizebox" "reflectbox")