diff --git a/packages/block-editor/src/components/rich-text/README.md b/packages/block-editor/src/components/rich-text/README.md
index e271bc5200e658..ed0f15d38ec019 100644
--- a/packages/block-editor/src/components/rich-text/README.md
+++ b/packages/block-editor/src/components/rich-text/README.md
@@ -21,6 +21,10 @@ Render a rich [`contenteditable` input](https://developer.mozilla.org/en-US/docs
 *Optional.* Placeholder text to show when the field is empty, similar to the
   [`input` and `textarea` attribute of the same name](https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/HTML5_updates#The_placeholder_attribute).
 
+### `keepPlaceholderOnFocus: Boolean`
+
+*Optional.* Show placeholder even when selected/focused, as long as there is no content.
+
 ### `multiline: Boolean | String`
 
 *Optional.* By default, a line break will be inserted on <kbd>Enter</kbd>. If the editable field can contain multiple paragraphs, this property can be set to create new paragraphs on <kbd>Enter</kbd>.