=== modified file 'lisp/textmodes/texinfo.el'
*** lisp/textmodes/texinfo.el	2014-01-01 07:43:34 +0000
--- lisp/textmodes/texinfo.el	2014-01-07 17:50:42 +0000
***************
*** 368,373 ****
--- 368,375 ----
      ("@\\(file\\|email\\){\\([^}]+\\)" 2 font-lock-string-face keep)
      ("@\\(samp\\|code\\|var\\|math\\|env\\|command\\|option\\){\\([^}]+\\)"
       2 font-lock-variable-name-face keep)
+     ;; @math allows nested braces like @math{2^{12}}
+     ("@math{\\(.+\\)}" 2 font-lock-variable-name-face keep)
      ("@\\(cite\\|x?ref\\|pxref\\|dfn\\|inforef\\){\\([^}]+\\)"
       2 font-lock-constant-face)
      ("@\\(anchor\\){\\([^}]+\\)" 2 font-lock-type-face)