diff --git a/packages/block-editor/src/components/rich-text/index.js b/packages/block-editor/src/components/rich-text/index.js
index 78116251224c7e..e19d9276ab2e78 100644
--- a/packages/block-editor/src/components/rich-text/index.js
+++ b/packages/block-editor/src/components/rich-text/index.js
@@ -115,6 +115,15 @@ function RichTextWrapper(
 	},
 	forwardedRef
 ) {
+	if ( multiline ) {
+		deprecated( 'wp.blockEditor.RichText multiline prop', {
+			since: '6.1',
+			version: '6.3',
+			alternative: 'nested blocks (InnerBlocks)',
+			link: 'https://developer.wordpress.org/block-editor/how-to-guides/block-tutorial/nested-blocks-inner-blocks/',
+		} );
+	}
+
 	const instanceId = useInstanceId( RichTextWrapper );
 
 	identifier = identifier || instanceId;