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-rw-r--r--guides/source/api_documentation_guidelines.md7
1 files changed, 6 insertions, 1 deletions
diff --git a/guides/source/api_documentation_guidelines.md b/guides/source/api_documentation_guidelines.md
index 46c9013087..526bf768cc 100644
--- a/guides/source/api_documentation_guidelines.md
+++ b/guides/source/api_documentation_guidelines.md
@@ -84,6 +84,11 @@ English
Please use American English (*color*, *center*, *modularize*, etc). See [a list of American and British English spelling differences here](http://en.wikipedia.org/wiki/American_and_British_English_spelling_differences).
+Comma
+-------
+
+Please use the Oxford comma (*red, white, and blue* style). See [the detail of Oxford comma](http://en.wikipedia.org/wiki/Serial_comma).
+
Example Code
------------
@@ -234,7 +239,7 @@ You can quickly test the RDoc output with the following command:
```
$ echo "+:to_param+" | rdoc --pipe
-#=> <p><code>:to_param</code></p>
+# => <p><code>:to_param</code></p>
```
### Regular Font