diff --git a/syntax/sh.nanorc b/syntax/sh.nanorc
index 9d36d7b8..b590674a 100644
--- a/syntax/sh.nanorc
+++ b/syntax/sh.nanorc
@@ -1,7 +1,7 @@
 ## Here is an example for Bourne shell scripts.
 
-syntax sh "\.sh$"
-header "^#!.*((ba|da|k|pdk)?sh[-0-9_]*|openrc-run|runscript)"
+syntax sh "(\.sh|\.(a|ba|c|da|k|mk|pdk|tc|z)(sh|shrc|sh_profile)|/(etc/|\.)profile)$"
+header "^#!.*(a|ba|c|da|k|mk|pdk|tc|z)?(sh[-0-9_]*|openrc-run|runscript)"
 magic "(POSIX|Bourne-Again) shell script.*text"
 linter dash -n
 comment "#"