什么是method article?

审稿意见回来了，看不太懂这个是什么？有没有大神指导一下。。。

MethodsX (optional)
We invite you to submit a method article alongside your research article. This is an to get full credit for the time and money spent on developing research methods, and to increase the visibility and impact of your work. If your research article is accepted, we will contact you with instructions on the submission process for your method article to MethodsX. On receipt at MethodsX it will be editorially reviewed and, upon acceptance, published as a separate method article. Your articles will be linked on ScienceDirect.