diff --git a/opts.lua b/opts.lua
index 5d86d6e..5669117 100644
--- a/opts.lua
+++ b/opts.lua
@@ -33,13 +33,13 @@ function opts.parse(arg)
   cmd:option('--n_threads',               4, 'Number of threads for multi-thread loading')
   cmd:option('--checkpoint',              10, 'Trained model is saved at every this epochs.')
   cmd:option('--manual_seed',             0, 'Manually set random seed')
-  cmd:option('--crop',                    'r', 'Spatial cropping method. random is uniform. corner is selection from 4 corners and 1 cetner. (r | c)')
+  cmd:option('--crop',                    'c', 'Spatial cropping method. random is uniform. corner is selection from 4 corners and 1 cetner. (r | c)')
   cmd:option('--no_hflip',                false, 'If true holizontal flipping is not performed.')
   cmd:option('--batch_norm',              false, 'If true batch normalization is added to C3D')
   cmd:option('--global_pooling',          false, 'If true global average pooling is added to C3D')
   cmd:option('--model',                   'c3d', 'Network model (c3d | resnet)')
-  cmd:option('--resnet_depth',            18, 'Depth of resnet')
-  cmd:option('--shortcut_type',           'A', 'Shortcut type of resnet')
+  cmd:option('--resnet_depth',            18, 'Depth of resnet (10 | 18 | 34 | 50 | 101 | 152)')
+  cmd:option('--shortcut_type',           'A', 'Shortcut type of resnet (A | B | C)')
   cmd:option('--weight_init',             false, 'Weight initialization for resnet')
   cmd:option('--test_subset',             'val', 'Subset to use for test_video (val | test)')
   cmd:option('--freeze_params',           0, '0 means all layers are trained. 1 means last layer is trained.')