diff --git a/packages/core/useClipboard/index.md b/packages/core/useClipboard/index.md
index 9998be7e43f..a2204fae07b 100644
--- a/packages/core/useClipboard/index.md
+++ b/packages/core/useClipboard/index.md
@@ -24,3 +24,5 @@ const { text, copy, copied, isSupported } = useClipboard({ source })
   <span v-else>Copied!</span>
 </button>
 ```
+
+Set `legacy: true` to keep the ability to copy if [Clipboard API](https://developer.mozilla.org/en-US/docs/Web/API/Clipboard_API) is not available. It will handle copy with [execCommand](https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand) as fallback.
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