diff --git a/pms2bemani/README.md b/pms2bemani/README.md
index 3252b3f..b28307f 100644
--- a/pms2bemani/README.md
+++ b/pms2bemani/README.md
@@ -21,10 +21,10 @@ optional arguments:
   --input-hp INPUT_HP   Input file (HP)
   --input-op INPUT_OP   Input file (OP)
   --output OUTPUT       Output folder
-  --preview PREVIEW     Input preview file (optional, overrides preview generation code)
+  --preview PREVIEW     Input preview file (overrides preview generation code)
   --new                 New chart format which supports hold notes
-  --bg BG               Background image (optional, must be 128x256)
-  --hariai HARIAI       Hariai image (optional, must be 250x322 or 382x502)
+  --bg BG               Background image (must be 128x256)
+  --hariai HARIAI       Hariai image (must be 250x322 or 382x502)
   --metadata-fw-title METADATA_FW_TITLE
                         Fullwidth music title for database
   --metadata-fw-artist METADATA_FW_ARTIST
@@ -71,12 +71,11 @@ required arguments:
 ```
 
 - Use `--new` to specify the new chart format (Usaneko and later) which supports hold notes.
-- Use `--ifs` to generate an `.ifs` file instead of a folder.
 - If a preview sound file is not specified with --preview, a preview will be automatically generated.
     - Automatically generated previews default to 10 seconds at the mid point of the chart.
     - The preview offset and duration can be customized using `--preview-offset` and `--preview-duration` respectively.
 
-Example: `python3 pms2bemani.py --input-np wonderingbeats/01_kouunn-n.pms --input-hp wonderingbeats/02_kouunn-h.pms --input-op wonderingbeats/03_kouunn-ex.pms --keysounds-folder wonderingbeats --name wonderingbeats_convert --ifs --new --preview-offset 10.4 --preview-duration 15`
+Example: `python3 pms2bemani.py --input-np wonderingbeats/01_kouunn-n.pms --input-hp wonderingbeats/02_kouunn-h.pms --input-op wonderingbeats/03_kouunn-ex.pms --keysounds-folder wonderingbeats --name wonderingbeats_convert --new --preview-offset 10.4 --preview-duration 15`
 
 ## Credits
 - ifstools (https://github.com/mon/ifstools)
diff --git a/pms2bemani/pms2bemani/pms2bemani.py b/pms2bemani/pms2bemani/pms2bemani.py
index 4dc54e9..40b9e0d 100644
--- a/pms2bemani/pms2bemani/pms2bemani.py
+++ b/pms2bemani/pms2bemani/pms2bemani.py
@@ -760,11 +760,11 @@ if __name__ == "__main__":
     requiredNamed.add_argument('--name', help='Base name used for output', default=None, required=True)
     requiredNamed.add_argument('--musicid', help='Music ID used for the database file', required=True, type=int)
     requiredNamed.add_argument('--keysounds-folder', help='Input folder containing keysounds', default=None, required=True)
-    parser.add_argument('--preview', help='Input preview file (optional, overrides preview generation code)', default=None)
+    parser.add_argument('--preview', help='Input preview file (overrides preview generation code)', default=None)
     parser.add_argument('--new', help='New chart format which supports hold notes', default=False, action='store_true')
     requiredNamed.add_argument('--banner', help='Banner image (must be 244x58)', default=None, required=True)
-    parser.add_argument('--bg', help='Background image (optional, must be 128x256)', default=None, required=False)
-    parser.add_argument('--hariai', help='Hariai image (optional, must be 250x322 or 382x502)', default=None)
+    parser.add_argument('--bg', help='Background image (must be 128x256)', default=None, required=False)
+    parser.add_argument('--hariai', help='Hariai image (must be 250x322 or 382x502)', default=None)
     parser.add_argument('--metadata-fw-title', help='Fullwidth music title for database', default=None)
     parser.add_argument('--metadata-fw-artist', help='Fullwidth music artist for database', default=None)
     parser.add_argument('--metadata-fw-genre', help='Fullwidth music genre for database', default=None)