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The computer program source code must have a good documentation on it in order to be more understandable by others. One of the documentation is comments. Therefore, the university students need to learn and able to write comments. Some university students are familiar with online judge as a tool for learning programming. Online judge usually does not check how the source code written instead of the output only. This research is aimed for implementing comment analysis module for online judge in order it can check the comments in the source code which is uploaded by students. The comments on this module are categorized as two parts. There are header and process comments. The comments data have taken from online judge which is used before as learning tool for basic programming subject. The data are divided into two groups. There are training group and test group. This module gives mark to the source code comments based on the categorized and similarity score between comments and the given problem.