diff --git a/thinkcspy/Chapter-5-Exercises/Lab Plotting a Sine Wave.md b/thinkcspy/Chapter-5-Exercises/Lab_Plotting_a_Sine_Wave.md
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rename from thinkcspy/Chapter-5-Exercises/Lab Plotting a Sine Wave.md
rename to thinkcspy/Chapter-5-Exercises/Lab_Plotting_a_Sine_Wave.md