FAQ/Questions/How-to-Add-a-Custom-Timespan-Type.md
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@@ -15,6 +15,8 @@ if (!AdHocSettings.CustomTimePeriods.ContainsKey("Lunar Cycle")) {
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##Modifying An Existing Time Period
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+You may at any time modify your existing set of custom time periods. You cannot, however, modify built-in time periods this way.
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```csharp
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CustomTimePeriod ctp = AdHocSettings.CustomTimePeriods["Lunar Cycle"];
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ctp.StartDate = DateTime.Now + ctp.Period; //passed by reference so the original list will update