The answer to this is DISCUSSION SECTION. This is where the limitations of the study are normally discussed. Basically, the purpose of the discussion section is to discuss the significance of your study and also the importance and relevance of the results of your study. Also, in this section, the limitations of the study is also included. This is very important so that the readers will further understand the limitations you have done in your research as this will affect their interpretation and analysis. You can either put this at the beginning of the section or at the conclusion.
