Use three '#' signs and a full stop to start your comment block.
Textile example: Textile comments
Some text here. ###. This is a textile comment block. It will be removed from your document. More text to follow.
Textile input (editable)
More about: Textile comments
1. Multi-line comments begin with two periods
###.. //////////////////////////// // This multi-line comment // will keep going and going // even if you put blank lines in. //////////////////////////////////
The comment will only end when it reaches a paragraph
2. HTML comments are respected also:
Here is some text with a <!-- Commented out --> block. <!-- Here is a single <span>line</span> comment block --> <!-- Here is a whole multiline <span>HTML</span> Comment --> Normal text continues here.