diff --git a/main.py b/main.py
index b002e12..80f1bef 100755
--- a/main.py
+++ b/main.py
@@ -72,7 +72,7 @@ async def state(ctx):
 
 # !co2
 @HobbyBot.command(description="co2 levels")
-async def co2(ctx, where='hoofdruimte'):
+async def co2(ctx, where="hoofdruimte"):
     async with ctx.typing():
         try:
             msg = await mqtt_get_one(f"bitlair/climate/{where}/co2_ppm")
@@ -115,7 +115,7 @@ async def np(ctx):
 
 # !bottleclip
 @HobbyBot.command(description="Generate a bottle-clip STL file suitable for printing")
-async def bottleclip(ctx, icon: str, ears: bool = False):
+async def bottleclip(ctx, icon: str = "", ears: bool = False):
     git_api = "https://git.bitlair.nl/api/v1"
     owner = "bitlair"
     repo = "bottle-clip"
@@ -139,7 +139,9 @@ async def bottleclip(ctx, icon: str, ears: bool = False):
         "pixel-cats/standing-right.svg",
     }
     if icon not in icons:
-        await ctx.reply(f"arg1 must be one of {', '.join(icons)}")
+        await ctx.reply(
+            f"usage: `!bottleclip <icon> [<ears y|n>]`\n* `icon` must be one of {', '.join(icons)}"
+        )
         return
 
     async with ctx.typing():