There are many problems faced by students in an online discussion forum, specifically regarding platforms that accommodate a large number of students such as the Massive Open Online Courses (MOOCs) platform. One of the problems is that the teacher cannot respond one by one to student comments that may contain questions or ideas. Therefore, the objectives of this research were to develop an adaptive instructional scaffolding feature that can be applied to online discussion forums and to perform usability measurements for this scaffolding. This feature provides an immediate response to student posts in the discussion forum in the form of article recommendations sourced from the Scopus database. These recommendations are based on the students' comments posted on online discussion forums. The development model used in this study is the instructional model ADDIE (Analyze, Design, Development, Implementation, Evaluation). To test the usability of the developed features, usability measurement using the usefulness, satisfaction, ease of use (USE) questionnaire was employed. The survey was conducted with 137 students at a public university in Indonesia. The results of the measurement showed that the usability level of the features we developed was shown to be high.