diff --git a/icnsutil/IcnsType.py b/icnsutil/IcnsType.py
index d649c47..2469d8f 100644
--- a/icnsutil/IcnsType.py
+++ b/icnsutil/IcnsType.py
@@ -4,7 +4,7 @@ Namespace for the ICNS format.
 @see https://en.wikipedia.org/wiki/Apple_Icon_Image_format
 '''
 import os  # path
-from typing import Union, Optional, Tuple, Iterator, List, Iterable
+from typing import Union, Optional, Tuple, Iterator, List, Iterable, Set
 from . import PackBytes, RawData
 
 
@@ -212,6 +212,10 @@ def enum_png_convertable(available_keys: Iterable[Media.KeyT]) \
             yield img.key, mask_key
 
 
+def supported_extensions() -> Set[str]:
+    return set(y for x in _TYPES.values() for y in x.types)
+
+
 def get(key: Media.KeyT) -> Media:
     try:
         return _TYPES[key]
diff --git a/icnsutil/cli.py b/icnsutil/cli.py
index 278ab9b..ad5cd28 100755
--- a/icnsutil/cli.py
+++ b/icnsutil/cli.py
@@ -137,14 +137,19 @@ def enum_with_stdin(file_arg: List[str]) -> Iterator[str]:
         if x == '-':
             for line in sys.stdin.readlines():
                 yield line.strip()
+        elif x.lower().endswith('.iconset'):  # enum directory content
+            allowed_ext = IcnsType.supported_extensions()
+            for fname in os.listdir(x):
+                if os.path.splitext(fname)[1][1:].lower() in allowed_ext:
+                    yield os.path.join(x, fname)
         else:
             yield x
 
 
 def main() -> None:
     class PathExist:
-        def __init__(self, kind: Optional[str] = None, stdin: bool = False):
-            self.kind = kind
+        def __init__(self, kind: str, *, stdin: bool = False):
+            self.kind, *self.allowed_ext = kind.split('|')
             self.stdin = stdin
 
         def __call__(self, path: str) -> str:
@@ -153,6 +158,8 @@ def main() -> None:
             if not os.path.exists(path) or \
                     self.kind == 'f' and not os.path.isfile(path) or \
                     self.kind == 'd' and not os.path.isdir(path):
+                if os.path.splitext(path)[1].lower() in self.allowed_ext:
+                    return path
                 raise ArgumentTypeError('Does not exist "{}"'.format(path))
             return path
 
@@ -197,8 +204,8 @@ def main() -> None:
         TOC is optional and uses just a few bytes (8b per media entry).''')
     cmd.add_argument('target', type=str, metavar='destination',
                      help='Output file for newly created icns file.')
-    cmd.add_argument('source', type=PathExist('f', stdin=True), nargs='+',
-                     metavar='src', help='''
+    cmd.add_argument('source', type=PathExist('f|.iconset', stdin=True),
+                     nargs='+', metavar='src', help='''
         One or more media files: png, argb, rgb, jp2, icns.
         --
         Icon dimensions are read directly from file.