diff --git a/README.md b/README.md
index d8a4de9..4daccda 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ more coming soon! i'm trying to copy pyzule in order to deprecate it in favor of
 - inject deb, dylib, framework, bundle, and appex files/folders
 - automatically fix dependencies on CydiaSubstrate **(cyan uses [ElleKit](https://github.com/evelyneee/ellekit/)!)**, Cephei*, and Orion
 - copy any unknown file/folder types to app root
+- change app name, version, bundle id, and minimum os version
 - remove UISupportedDevices
 - remove watch app
 - fakesign the output ipa/app
@@ -45,5 +46,7 @@ then finally, to install or update cyan, just `pip install --force-reinstall git
 
 [x] feat: plugin operations (-q, -e)
 
+[] feat: change app icon
+
 [] feat: .cyan files (lol rip .pyzule files)
 
diff --git a/cyan/tbhutils.py b/cyan/tbhutils.py
index ed9399b..ef9e15d 100644
--- a/cyan/tbhutils.py
+++ b/cyan/tbhutils.py
@@ -48,6 +48,12 @@ def validate_inputs(args: Namespace) -> Optional[str]:
         print(f"[?] - {ne}")
       sys.exit(1)
 
+  if (
+      args.m is not None
+      and any(char not in "0123456789." for char in args.m)
+  ):
+    sys.exit(f"[!] invalid OS version: {args.m}")
+
 
 def get_app(path: str, tmpdir: str, is_ipa: bool) -> str:
   payload = f"{tmpdir}/Payload"