diff --git a/test_regress/t/t_trace_timescale.cpp b/test_regress/t/t_trace_timescale.cpp
index 847b5b9df..96632f559 100644
--- a/test_regress/t/t_trace_timescale.cpp
+++ b/test_regress/t/t_trace_timescale.cpp
@@ -39,6 +39,8 @@ int main(int argc, char **argv, char **env) {
 	top->clk   = ~top->clk;
 	top->eval();
 	tfp->dump((unsigned int)(main_time));
+	// Advance by 0.5 time units, to make sure our fractional
+	// time is working correctly
 	main_time += VL_TIME_MULTIPLIER/2;
     }
     tfp->close();