Makeweight
/ˈmeɪkweɪt/
Definition 1 of 1
Pro Tip 1/3Added Balance
Makeweight refers to something added, often unnecessarily, to create a balance or to make something appear more substantial. 
The publisher included several old articles as makeweights to bulk up the magazine.
Pro Tip 2/3Lack of Importance
Understand that a makeweight doesn't add real value or importance; its role is mainly to supplement. 
To reach the required word count, his essay included a few paragraphs as makeweights.
Pro Tip 3/3Not Primary
A makeweight isn't the main focus; it supports or complements the primary elements. 
The extensive appendix was just a makeweight to the main report.