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Note: While consistent writing is helpful for users, it's even more important to have accurate content. Please don't worry about being mocked or having a change refused because of a spelling error or not following this style guide exactly.

This guide contains basic rules, tips, and suggestions for people writing or editing documentation for MODX focused on the writing style. When different documents use the same guidelines, they are more user-friendly, consistent and more simple to combine and reuse. If you can, please do follow these guidelines.

Use US English

Throughout MODX, US English is the standard for all written materials.

General Rules

-our vs. -or

UK words ending in -our (such as flavour) lose their U when converted to US English. For example flavour becomes flavor, colour becomes color. The same thing usually applies to words with -our in the middle, so behaviour becomes behavior.

Double Consonants

When you convert a verb to its -ing form, remember that US English has a single, not a double consonant. For example travelling becomes traveling, levelling becomes leveling etc.

List of common UK and US spellings

For a more exhaustive list, see Wikipedia

UK English US English
Analyse Analyze
Behaviour Behavior
Cancelling / Cancelled Canceling / Canceled
Centre Center
Cheque Check
Colour Color
Customisation Customization
Customise Customize
Favourite Favorite
Labour Labor
Licence License
Travelling Traveling

Writing Rules

These are some rules that make documents more clear, precise, and easy to understand.

Keep it simple

Use short sentences and punctuation to keep ideas clear and simple. Introduce a single idea, concept or action per sentence.


The manufacturing module allows users to define the process plans, work requirements and work efforts; this is how the processes that produce intermediate and final goods work.


The manufacturing module allows users to define the process plans, work requirements and work efforts. This section describes how processes that produce intermediate and final goods function.


Always use the present tense. Avoid past or future tenses if possible.

In addition, try to refrain from using must, have to, need to, will, should and similar forms.

Keep in mind that a manual describes mandatory procedures to follow to accomplish a certain task.


You will have to press return to reboot the system.


Press return to reboot the system.

Aggressive Language

Avoid using aggressive descriptions.


Hit return to reboot the system.


Press return to reboot the system.

Use the active voice

Write using the active voice where possible.


The alarm was fired by the system.


The system fired the alarm.

Using the active voice makes documentation easier to read and understand. It also helps to clarify who is doing what, and that is important in user documentation.

If you are writing an error message, it is acceptable to use the passive voice to avoid blaming the user.

Use third person

Where possible, use the third person imperative. For example:

Run the installation script

is better than:

You should run the installation script

However, so long as you don't overdo it or sound aggressive, it's fine to address the user directly using "you" if it makes the documentation easier to follow.

Avoid referring to the user as "the user", for example: "Users should log into the system using their passwords", unless you are specifically distinguishing between users and somebody else e.g. an administrator

The exception to these guidelines is error messages: if error messages address the user directly, they can sound blaming. For example:

'Error: incorrect password'

is better than:

'Error: you have entered an invalid password'


Exclamation marks

There are virtually no circumstances where it is acceptable or necessary to use an exclamation mark in documentation or in error messages.


Do not use an apostrophe for plural abbreviations:#### Wrong: Use the Purchase Order window to create PO's Right: Use the Purchase Order window to create POs

No personal opinions

A manual or any other technical document is not the right place to make statements about what you think about competitors, products or the features described.


Select the Report option to generate a full report of the customer data. Most of the time is better to export the data and generate a report from third-party applications due to the lack of configuration settings.


Select the Report option to generate a full report of the customer data. It is also possible to export data and generate a report from third-party applications.

Also, be careful about expressing an opinion on whether a task is easy or not. If the user makes a mistake when you have mentioned that a task is simple, it can make them feel stupid even if the mistake is not their fault. For example, avoid expressions like:

"It is easy to configure the application using the Wizard".


Avoid over-capitalization. It can be tempting to capitalize particular words in a sentence just because they seem important, but this looks untidy and makes it hard to maintain consistency in a long document. Only proper names, menu items and proprietary names require leading capitals.

Avoid gender discrimination

Readers of software documentation are men and women. Unfortunately in English there no personal or possessive pronoun that denote gender neutrality. Avoid using expressions that refer to specific gender forms. Pay special attention to the she, he, him or her pronouns.


Every user has his home directory.

Every user has a home directory.

Although it's technically incorrect, many technical authors now use "they" or "their" as a neutral pronoun rather than "s/he" or "his or hers". It's not perfect but if you have a lot of pronouns in one sentence it can make it easier to read. In general try to rephrase the sentence to avoid the issue - see the example above.

User stories and training scenarios are a good place to show diversity.

Remember that in English, only people have a gender. Most other nouns are neutral.

Only describe current functionality

Avoid talking about future features or plans for a product or an application.


Graphics can be saved as a GIF image. Support for new formats will be added in future versions.


Graphics can be saved as a GIF image.



Checkbox is all one word (not check box). Checkboxes are either selected or cleared.

For example:

"Select the Active checkbox to make the field visible" "Clear the Active checkbox to make the field invisible".

Login vs Log in

The verb is Log in and Log into "Log in using the password provided" "Log into MODX ERP" The noun or adjective is Login "You will need valid Login credentials to use the system"

Not logon, log, log-in etc.

Spanish — English False Friends and other pitfalls

If Spanish is your first language, beware of the following common mistakes

Dudas / doubts

"Doubt" in english usually has quite a negative meaning. A better translation is questions or queries.

Wrong: If you have any doubts about MODX, consult the wiki. Better: If you have any questions about MODX, consult the wiki.

His / hers

In English, only people have a gender. Things are always neutral and take the possessive pronoun "its" (without an apostrophe).

Bold and Italics

Because we use different documentation sources, including Mediawiki, a limited number of formatting styles are used:

  • Bold. Use sparingly for emphasis, or to highlight file paths or option names, for example:

From the File menu, select New.

  • Italic. Use it when quoting a piece of a text from another source, a piece of text in another language or to give an example, such as sample text to be typed in a text field.

File / Menu Paths

File paths (i.e. particular file locations) should follow the standard "Directory/subdirectory/file.extension" format.

  • For menu navigation (for example starting a new document) bold the whole thing and use > to separate the menu items.

Orient the user by starting with the first thing the user needs to look for. For example:

From the File menu, select Document > New > Template.


Select Document > New > Template from the File menu.

Naming images andshots

When uploading images or screenshots, name must be related to page's title. If same page contains more than a image, you can additionaly give a number. For example, in Payment Method page, images will be named as paymentmethod01, paymentmethod02, etc.


MODX runs on many different platforms. When documenting a feature that varies by platform, note the platform before the example or exception. Readers can then skip sections, rather than reading a paragraph before finding it is not relevant, and having to search for the correct section.

Phrase language and layout in a way that allows future editors familiar with a platform to add valid examples. Platform variations are a sensitive topic, keep language neutral and factual. For example:


To start MODX POS double click start.bat



To start MODX POS run the shell script start.sh either by clicking it or by typing ./start.sh from a shell.


To start MODX POS run the batch file start.bat either by double clicking it or by typing start.bat from the command line.

Other Conventions

When describing options always start from left to right and from top to bottom.

  • If you have a list of items (for example a list of files to be downloaded) order them alphabetically unless there is a more obvious logical order.
  • Try to be consistent with the way you describe similar processes. For example don't mix mouse navigation in with keystrokes in the same procedure unless it's really necessary. In general, pick your interaction style (menus, keystrokes etc) and stick with it throughout the document.
  • Do not use contractions (don't, you're, etc)

Writing for a global audience

Some important recommendations:

  • Avoid using names of people, addresses, and other sample information that are not common in the English language.

  • Remember that currencies and formats to represent dates and numbers are not the same in every part of the world.

Page Formatting and Markup

There is a limited set of formatting elements in order to make it easy for editors and provide consistent formatting for readers. The following shows what formats are available for HTML and special formats for the MODX Documentation

Permitted HTML Markup

Format Type Usage Example
Normal Text This is the text format used for all paragraph text and inside tables.
Bold (TBD)
Italics (TBD)
Bulleted Lists (TBD)
Numbered Lists (TBD)
Indents Reserve indentation for use in creating nested or child lists. Paragraphs should not be
Images (TBD)
Media (TBD)
Table (TBD)
Links (TBD)
Text-Alignment Reserve text-alignment for table cells. It should not be used to center, right or jusitfy text. Paragraph and headings must be left-aligned.

Special Formats

Format Type Usage Example
PHP Code This is a special macro-format for wrapping code examples including PHP, HTML, CSS and Javascript. This will enable syntax highlighting and enhance the readibility of the page.
Note (TBD)
Warning (TBD)
Danger (TBD)
Info (TBD)

Other HTML elements such as divs, spans, blockquotes, address and etc. should not be used. This makes maintaining the documentations more difficult and can potentially create issues with layouts. Classes and IDs should not be used in markup. Special classes used when formatting in HTML are created by the Special Format macros listed above.

Final checklist

Before considering a document or change complete, it is a good idea to perform the following quick checklist:

  • It is clear? Does the text follow well from paragraph to paragraph?
  • It is concise? Does it have a clear communication style?
  • It is coherent? Does the text jumps from topic to topic?
  • It is grammatically correct? Have you spell checked the text? Have you asked a native speaker to proof-read your text

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