diff --git a/javascript.nanorc b/javascript.nanorc
index 2cdd4a2..6e5800e 100644
--- a/javascript.nanorc
+++ b/javascript.nanorc
@@ -1,4 +1,4 @@
-syntax "JavaScript" "\.(js|ts)$"
+syntax "JavaScript" "\.(m?js|ts)$"
 comment "//"
 color blue   "\<[-+]?([1-9][0-9]*|0[0-7]*|0x[0-9a-fA-F]+)([uU][lL]?|[lL][uU]?)?\>"
 color blue   "\<[-+]?([0-9]+\.[0-9]*|[0-9]*\.[0-9]+)([EePp][+-]?[0-9]+)?[fFlL]?"
diff --git a/js.nanorc b/js.nanorc
index 8991928..820112e 100644
--- a/js.nanorc
+++ b/js.nanorc
@@ -1,4 +1,4 @@
-### all *js files  ( e.g. Firefox user.js, prefs.js )
+### all *js and *mjs files  ( e.g. Firefox user.js, prefs.js )
 
 ## Old version
 
@@ -12,7 +12,7 @@
 
 ## New updated taken from http://wiki.linuxhelp.net/index.php/Nano_Syntax_Highlighting
 
-syntax "JavaScript" "\.(js)$"
+syntax "JavaScript" "\.(m?js)$"
 header "^#!.*\/(env +)node"
 comment "//"