diff --git a/Common-Errors.md b/Common-Errors.md
index 66cc917..4dcaa7c 100644
--- a/Common-Errors.md
+++ b/Common-Errors.md
@@ -26,6 +26,9 @@ Starting with version 2.1.0, you need to add an API token to settings.general.js
 
 Your settings.general.json file is likely missing a necessary setting in the "Application" section.  Check the release notes for any recent releases that you might have skipped since you last updated PTMagic, for any REQUIRED settings changes.
 
+### PTMagic has been raiding since <DATE> <TIME>
+This usually happens when a raid takes longer than the **IntervalMinutes** you've set in settings.analzyer.json.  The interval has elapsed, and PTM is trying to start a new raid, but the previous raid is still being executed.  This not a serious problem, however, descreasing resource usage by other applications, or increasing PTM's priority can help speed up raids.
+
 ### Unhandled Exception:  Newtonsoft.Json.JsonReaderException
 Your settings.general.json file is likely missing a comma after one of your settings.  You can also use a [JSON validator](https://codebeautify.org/jsonvalidator) tool to check for other errors.