diff --git a/sh.nanorc b/sh.nanorc
index febc22c..c418262 100644
--- a/sh.nanorc
+++ b/sh.nanorc
@@ -17,7 +17,7 @@ color brightblue "\<(alias|bg|bind|break|builtin|caller|cd|command|compgen|compl
 ## not buitins:
 ## cat|chmod|chown|cp|env|grep|install|ln|make|mkdir|mv|rm|sed|tar|touch
 icolor brightgreen "^\s+[0-9A-Z_]+\s+\(\)"
-icolor brightred "\$\{?[0-9A-Z_!@#$*?-]+\}?"
+icolor brightred "\$\{?[0-9A-Z_!@#%$*?-]+\}?"
 color brightyellow ""(\\.|[^"])*"" "'(\\.|[^'])*'"
 color cyan "(^|[[:space:]])#.*$"
 color ,green "[[:space:]]+$"