The article outlines the technical writing tutorial (TWT) that preceded an advanced ESL writing course for students of English Philology at the Jagiellonian University. Having assessed the English skills of those students at the end of the semester, we found a statistically significant increase in the performance of the students who had taken the TWT in comparison to the control group who spent the time of TWT doing more traditional exercises. This result indicates that technical writing books and journals should be considered as an important source of information for teachers of writing to ESL students.