This list compiles the most common format, markup, structure, and grammar rules for your convenience. You can find more detailed information in the referenced sections.


  • Limit line length to 78 characters. The GitHub web interface forces this limitation for readability.
  • Remove trailing white space from your documents.
  • Use short sentences and paragraphs. Keep sentence length under 20 words.
  • Use only lower case letters for filenames.
  • Separate multiple words in filenames using dashes.


  • Use the appropriate ReST roles for your content. See the ReST primer for the complete list of roles.
  • Use the :abbr: role to define the first instance of an abbreviation, for example: :abbr:`CL (Clear Linux)`.
  • Use hash-tags to underline the file’s main title.
  • Use asterisks to underline the file’s first level headings.
  • Use equal signs to underline the file’s second level of headings.
  • Use dashes to underline the file’s third level of headings.
  • Use labels to reference documentation sections. Do not reference sections with URLs. See Cross-references for details.
  • Don’t use explicit URLs as links, for example
  • Always include descriptive link text. For example: Visit the Clear Linux website. Do not use “here”, “this”, or similar references for link text.


  • All files must have a main title and up to three levels of headings. Restructure the content in multiple files as needed to comply.
  • Use descriptive headings.
  • Follow all headings with at least one paragraph of content. There should never be two consecutive headings.
  • Separate the link and the target definition. All target definitions must be included at the end of the file. See Cross-references for details.
  • Use parallelism in headings, sentences, and lists. See our Parallelism for details.
  • Put conditional phrases first in cautions and warnings. For example: “If you do X, then Y will occur.” See our Notices: notes, cautions, warnings, and dangers guide.
  • Place figures and tables immediately after related text.
  • Place code or commands immediately after the leading text in a new line, see our Code blocks.
  • Reference figures, code examples, and tables by number. For example, use “Figure 1,” instead of “The figure above or below”. See Cross-references and Images.
  • Include at least one direct reference to any table or figure you add. See Tables.


  • Include only one main idea in a sentence. See Simple English.
  • Limit the number of clauses you use to no more than two. See Simple English.
  • Limit the number of sentences per paragraph to about six. See Simple English.
  • Use strong verbs. See Simple English.
  • Use action verbs. See Simple English.
  • Avoid weak verbs like be, have, make, and do. See Simple English.
  • Use short direct commands and avoid niceties such as the word “please”.
  • Use the present tense wherever possible and avoid past and future tense verbs. See Simple English.
  • Use Active voice. Write, “Someone does something”; don’t write, “Something is done by someone” or “Something is done.” See Simple English.
  • Use “we” for recommendations. Write “We recommend...” as opposed to “It is recommended....” See Simple English.
  • Use “you” rather than “the user” in your instructions.
  • Use short common English words whenever possible, see our Simple English guide.
  • Avoid contractions. See Grammar guide.
  • Use articles such as ‘a’, ‘an’, and ‘the’ to reduce ambiguity.

Additional information

Learn more about the accepted rules of grammar, punctuation, and word use in our Language reference guide. If you are looking for tips on how to write shorter, clearer, and more concise content, visit our Simple English guide.