Add formatting giudelines.

_posts/2018-01-04-cfp.md

@@ -36,8 +36,10 @@ Topics of interest include, but are not limited to:
 
 ## Submission Information
 
-WAPI 2018 invites contributions in the form of **4-page papers** from both researchers and practitioners, as well as **talk abstracts** from practitioners. Submissions can be research papers, practice papers, position papers, or experience reports.
+WAPI 2018 invites contributions in the form of **4-page papers** from both researchers and practitioners, as well as **talk abstracts** from practitioners.
+Submissions can be research papers, practice papers, position papers, or experience reports.
 All submissions should describe unpublished work and must have been neither previously accepted for publication nor concurrently submitted for review in another journal, book, conference, or workshop.
+All submission must follow the [ACM formatting instructions](https://www.icse2018.org/track/icse-2018-Double-blind-review#Formatting).
 Submissions are peer-reviewed and accepted papers will appear in the workshop proceedings.
 
 ## Important Dates