diff --git a/readme.md b/readme.md
index 0d396eb..30088ea 100644
--- a/readme.md
+++ b/readme.md
@@ -21,15 +21,16 @@ Alternatively, just run it:
 
 All of these are optional.
 
-| Define                      | Description                                                                                 |
-| --------------------------- | ------------------------------------------------------------------------------------------- |
-| `-D watch.run=(string)`     | command to execute on successful builds                                                     |
-| `-D watch.port=(integer)`   | use this port for the completion server                                                     |
-| `-D watch.connect`          | connect to a running completion server (use with `watch.port`)                              |
-| `-D watch.excludeRoot`      | exclude watching the root directory (see [#3](https://github.com/benmerckx/watch/issues/3)) |
-| `-D watch.exclude=(string)` | exclude this path from the watcher (can be repeated for multiple paths)                     |
-| `-D watch.include=(string)` | include this path in the watcher (can be repeated for multiple paths)                       |
-| `-D watch.verbose`          | extra log before and after every build                                                      |
+| Define                      | Description                                                                                       |
+| --------------------------- | ------------------------------------------------------------------------------------------------- |
+| `-D watch.run=(string)`       | command to execute on successful builds                                                           |
+| `-D watch.port=(integer)`     | use this port for the completion server                                                           |
+| `-D watch.connect`            | connect to a running completion server (use with `watch.port`)                                    |
+| `-D watch.excludeRoot`        | exclude watching the root directory (see [#3](https://github.com/benmerckx/watch/issues/3))       |
+| `-D watch.exclude=(string)`   | exclude this path from the watcher (can be repeated for multiple paths)                           |
+| `-D watch.include=(string)`   | include this path in the watcher (can be repeated for multiple paths)                             |
+| `-D watch.verbose`            | extra log before and after every build                                                            |
+| `-D watch.extensions=(string)`| extensions to watch, seperated by comma but without dot prefix (will watch '.hx files per default)|
 
 ### Example
 
diff --git a/src/watch/Watch.hx b/src/watch/Watch.hx
index 6018877..a2de872 100644
--- a/src/watch/Watch.hx
+++ b/src/watch/Watch.hx
@@ -439,11 +439,16 @@ function register() {
         for (path in paths) {
           switch FsEvent.init(loop) {
             case Ok(watcher):
-              watcher.start(path, [],
-                res ->
+
+              watcher.start(path, [], res ->
                 switch res {
                   case Ok({file: (_.toString()) => file}):
-                    if (StringTools.endsWith(file, '.hx')) {
+                  final extensions = switch Context.definedValue('watch.extensions') {
+                    case null: ['.hx'];
+                    case v: v.split(',').map(s -> '.$s');
+                  } 
+                  final resExtension = file.substring(file.lastIndexOf('.'));
+                  if (extensions.contains(resExtension)) {
                       for (exclude in excludes) {
                         if (isSubOf(FileSystem.absolutePath(file), exclude)) 
                           return;
@@ -471,4 +476,4 @@ function register() {
     });
   });
   loop.loop();
-}
+}
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