In diesem Post, steht viel Lesenswertes zum Thema commit-Messages. Kern sind diese Regeln:

1. Separate subject from body with a blank line
2. Limit the subject line to 50 characters
3. Capitalize the subject line
4. Do not end the subject line with a period
5. Use the imperative mood in the subject line
6. Wrap the body at 72 characters
7. Use the body to explain what and why vs. how

Herausheben möchte ich ein Zitat:

A properly formed git commit subject line should always be able to complete the following sentence:

• If applied, this commit will your subject line here

For example:

• If applied, this commit will refactor subsystem X for readability
• If applied, this commit will update getting started documentation
• If applied, this commit will remove deprecated methods
• If applied, this commit will release version 1.0.0
• If applied, this commit will merge pull request #123 from user/branch

Notice how this doesn’t work for the other non-imperative forms:

• If applied, this commit will fixed bug with Y
• If applied, this commit will changing behavior of X
• If applied, this commit will more fixes for broken stuff
• If applied, this commit will sweet new API methods

Remember: Use of the imperative is important only in the subject line. You can relax this restriction when you’re writing the body.

Zur „Ehrung“ nenne ich nochmal die Quelle: http://chris.beams.io/posts/git-commit/