diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -295,6 +295,7 @@ Other pieces: `Request-PkAbort` triggers the same abort from code. `Test-PkAbort
 ## Limits
 
 - Windows PowerShell 5.1, Windows only (console and Job Object APIs).
+- Run it in a PowerShell console window or an editor's terminal (graceful Ctrl+C tested in Windows Terminal and Visual Studio's built-in terminal). The Windows PowerShell ISE isn't supported: tested there, the kit loads and runs, but the ISE has no console, so Ctrl+C stops the script outright, with no graceful drain and no cleanup callbacks.
 - It needs FullLanguage mode, since it compiles a little C# with `Add-Type` when loaded. On a machine locked down to Constrained Language Mode (usually by AppLocker or Windows Defender Application Control), loading it fails with a message saying so. Some endpoint security products also flag scripts that compile code calling Windows APIs at runtime; if yours blocks the kit, that's the likely reason.
 - After changing `ParallelKit.ps1` itself, start a new PowerShell window. A session keeps the kit's compiled parts until it closes; the kit tells you if it finds an older copy loaded.
 - One run at a time per process. The abort state is shared. A nested `Invoke-PkRun` just runs inside the outer one.