Colons

Introductory phrase preceding colon

When a colon introduces a list, the text that precedes the colon must be able to stand alone as a complete sentence.

Examples

Not recommended: The fields are:

Recommended: The fields are defined as follows:

Bold text preceding colon

When the text preceding a colon is bold, make the colon bold too.

Colons within sentences

In general, the first word in the text that follows a colon should be in lowercase.

Examples

Recommended: Tone: concise, conversational, friendly, respectful.

Recommended: When you add or update content to an existing project, remember to take these steps: review the style guide; use checklists; enlist a fellow writer or an editor to copyedit your work; and request a developmental edit if you feel that it's warranted.

See also

For more information about how to punctuate introductory material, see the sections on list introductions and code-sample introductions.

For information about when it's better to use colons than dashes, see Dashes.

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Google Developer Documentation Style Guide
Google Developer Documentation Style Guide