diff --git a/ch17/ch17-part1.ipynb b/ch17/ch17_part1.ipynb
similarity index 100%
rename from ch17/ch17-part1.ipynb
rename to ch17/ch17_part1.ipynb
diff --git a/ch17/ch17-part2.ipynb b/ch17/ch17_part2.ipynb
similarity index 100%
rename from ch17/ch17-part2.ipynb
rename to ch17/ch17_part2.ipynb