diff --git a/TerminalDocs/command-line-arguments.md b/TerminalDocs/command-line-arguments.md
index 916d084a..1ca51beb 100644
--- a/TerminalDocs/command-line-arguments.md
+++ b/TerminalDocs/command-line-arguments.md
@@ -54,6 +54,9 @@ Commands may vary slightly depending on which command line you're using.
 
 ### Target a specific window
 
+> [!IMPORTANT]
+> The `--window,-w` parameter is only available in [Windows Terminal Preview](https://aka.ms/terminal-preview), version 1.7+.
+
 Below are examples of how to target specific windows using the `--window,-w` option.
 
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