diff --git a/src/video2x.yaml b/src/video2x.yaml
index cde8788..2e66712 100644
--- a/src/video2x.yaml
+++ b/src/video2x.yaml
@@ -55,15 +55,16 @@ waifu2x_converter_cpp:
 waifu2x_ncnn_vulkan:
   path: '%LOCALAPPDATA%\video2x\waifu2x-ncnn-vulkan\waifu2x-ncnn-vulkan'
   v: null # verbose output
-  #i: null # input-path: input image path (jpg/png) or directory
-  #o: null # output-path: output image path (png) or directory
+  #i: null # input-path: input image path (jpg/png/webp) or directory
+  #o: null # output-path: output image path (jpg/png/webp) or directory
   'n': 2 # noise-level: denoise level (-1/0/1/2/3, default=0)
   s: 2 # scale: upscale ratio (1/2, default=2)
   t: 400 # tile-size: tile size (>=32, default=400)
   m: null # model-path: waifu2x model path (default=models-cunet)
   g: 0 # gpu-id: gpu device to use (default=0)
-  j: '1:2:2' # thread count for load/proc/save (default=1:2:2)
+  j: '1:2:2' # thread count for load/proc/save (default=1:2:2) can be 1:2,2,2:2 for multi-gpu
   x: false # enable tta mode
+  f: png # output image format (jpg/png/webp, default=ext/png)
 srmd_ncnn_vulkan:
   path: '%LOCALAPPDATA%\video2x\srmd-ncnn-vulkan\srmd-ncnn-vulkan'
   v: null # verbose output
diff --git a/src/wrappers/waifu2x_ncnn_vulkan.py b/src/wrappers/waifu2x_ncnn_vulkan.py
index 0d72789..f5da9f3 100755
--- a/src/wrappers/waifu2x_ncnn_vulkan.py
+++ b/src/wrappers/waifu2x_ncnn_vulkan.py
@@ -44,8 +44,8 @@ class WrapperMain:
         parser.error = lambda message: (_ for _ in ()).throw(AttributeError(message))
         parser.add_argument('--help', action='help', help='show this help message and exit')
         parser.add_argument('-v', action='store_true', help='verbose output')
-        parser.add_argument('-i', type=str, help=argparse.SUPPRESS)  # help='input image path (jpg/png) or directory')
-        parser.add_argument('-o', type=str, help=argparse.SUPPRESS)  # help='output image path (png) or directory')
+        parser.add_argument('-i', type=str, help=argparse.SUPPRESS)  # help='input image path (jpg/png/webp) or directory')
+        parser.add_argument('-o', type=str, help=argparse.SUPPRESS)  # help='output image path (jpg/png/webp) or directory')
         parser.add_argument('-n', type=int, choices=range(-1, 4), help='denoise level')
         parser.add_argument('-s', type=int, help='upscale ratio')
         parser.add_argument('-t', type=int, help='tile size (>=32)')
@@ -53,6 +53,7 @@ class WrapperMain:
         parser.add_argument('-g', type=int, help='gpu device to use')
         parser.add_argument('-j', type=str, help='thread count for load/proc/save')
         parser.add_argument('-x', action='store_true', help='enable tta mode')
+        parser.add_argument('-f', type=str, help='output image format (jpg/png/webp, default=ext/png)')
         return parser.parse_args(arguments)
 
     def load_configurations(self, upscaler):