There's a typo in the documentation for the 511 feature, it says "mutbale_appearance".
http://puu.sh/tBSOg/6a2be83ad9.png
Numbered Steps to Reproduce Problem:
1. Go to C:\Program Files(x86)\BYOND\help\ref
2. Open index.hml
3. Look at the left side and be extremely triggered at this typo
Code Snippet (if applicable) to Reproduce Problem:
mutbale_appearance
Expected Results:
For it to be spelled correctly
Actual Results:
There's a typo
Does the problem occur:
Every time? Or how often?
In other games?
In other user accounts?
On other computers?
It happens in 511
When does the problem NOT occur?
It doesn't occur before 511 because mutable_appearance wasn't a thing before 511
Did the problem NOT occur in any earlier versions? If so, what was the last version that worked? (Visit http://www.byond.com/download/build to download old versions for testing.)
It doesn't occur before 511 because mutable_appearance wasn't a thing before 511
Workarounds:
Try really hard to ignore the typo