They say

• Tabs are set every three spaces.
• Variable and function names are lowercase.
• Constant names are uppercase. Class names start with an uppercase letter.
• There are spaces after reserved words and between binary operators.
• Braces must line up.
• No magic numbers may be used.
• Every function must have a comment.
• At most 30 lines of code may be used per function.
• No goto, continue, or break is allowed.
• At most two global variables may be used per file.