diff --git a/tex.nanorc b/tex.nanorc
index 56aaa8b..b768ed1 100644
--- a/tex.nanorc
+++ b/tex.nanorc
@@ -1,7 +1,8 @@
 ## Here is a short example for TeX files.
 ##
 syntax "TeX" "\.tex$" "bib" "\.bib$" "cls" "\.cls$"
-color yellow "\$[^$]*\$"
+color yellow "\$(\\\$|[^$])*[^\\]\$"
+color yellow "\$\$(\\\$|[^$])*[^\\]\$\$"
 icolor green "\\.|\\[A-Z]*"
 color magenta "[{}]"
 color blue "%.*"