CONTEXT: Recent studies on story point estimation used deep learning-based language models. These language models were pre-trained on general corpora. However, using language models further pre-trained with specific corpora might be effective. OBJECTIVE: To examine the effectiveness of further pre-trained language models for the predictive performance of story point estimation. METHOD: Two types of further pre-trained language models, namely, domain-specific and repository-specific models, were compared with off-the-shelf models and Deep-SE. The estimation performance was evaluated with 16 project data. RESULTS: The effectiveness of domain-specific and repository-specific models were limited though they were better than the base model they further pre-trained. CONCLUSION: The effect of further pre-training was small. Large off-the-shelf models might be better to be chosen.