Update time.rst

topasmc · Mar 3, 2021 · b1cca14 · b1cca14
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diff --git a/parameters/time.rst b/parameters/time.rst
@@ -80,6 +80,10 @@ Here is an example of a Step time feature that controls a String::
 * The third value is used for times 20 to 30 ms.
 * After 30 ms, the value cycles back to the first value.
 
+Note that the first member of Values is not the time that the first Value should be used.
+It is the time that the first Change of value should be made.
+The first Value will be used for the time between Tf/TimelineStart and that first member of Tf/*/Times.
+
 Note that whereas continuous functions (Linear, Sine, Cosine and Sqrt) include a ``RepetitionInterval``, Step Functions do not. They just cycle back to the first ``Value`` after the last of the ``Times`` is reached.
 
 Here is an example of a Step time feature that controls a Boolean::