diff --git a/packages/ckeditor5-essentials/ckeditor5-metadata.json b/packages/ckeditor5-essentials/ckeditor5-metadata.json
index e3b681a8113..e98f2336257 100644
--- a/packages/ckeditor5-essentials/ckeditor5-metadata.json
+++ b/packages/ckeditor5-essentials/ckeditor5-metadata.json
@@ -5,18 +5,6 @@
 			"className": "Essentials",
 			"description": "Includes all essential editing features like the clipboard, <kbd>Enter</kbd> and <kbd>Shift</kbd>+<kbd>Enter</kbd> keystrokes, typing and the undo support.",
 			"path": "src/essentials.js",
-			"uiComponents": [
-				{
-					"type": "Button",
-					"name": "undo",
-					"iconPath": "@ckeditor/ckeditor5-undo/theme/icons/undo.svg"
-				},
-				{
-					"type": "Button",
-					"name": "redo",
-					"iconPath": "@ckeditor/ckeditor5-undo/theme/icons/redo.svg"
-				}
-			],
 			"htmlOutput": [
 				{
 					"elements": "br"
diff --git a/packages/ckeditor5-image/ckeditor5-metadata.json b/packages/ckeditor5-image/ckeditor5-metadata.json
index c977fe85dd1..2f6789e136e 100644
--- a/packages/ckeditor5-image/ckeditor5-metadata.json
+++ b/packages/ckeditor5-image/ckeditor5-metadata.json
@@ -23,7 +23,7 @@
 				{
 					"type": "Button",
 					"name": "imageTextAlternative",
-					"iconPath": "",
+					"iconPath": "@ckeditor/ckeditor5-core/theme/icons/text-alternative.svg",
 					"toolbars": [
 						"image.toolbar"
 					]
@@ -57,7 +57,7 @@
 				{
 					"type": "Button",
 					"name": "imageTextAlternative",
-					"iconPath": "",
+					"iconPath": "@ckeditor/ckeditor5-core/theme/icons/text-alternative.svg",
 					"toolbars": [
 						"image.toolbar"
 					]
@@ -97,7 +97,7 @@
 				{
 					"type": "Button",
 					"name": "toggleImageCaption",
-					"iconPath": "",
+					"iconPath": "@ckeditor/ckeditor5-core/theme/icons/caption.svg",
 					"toolbars": [
 						"image.toolbar"
 					]
diff --git a/packages/ckeditor5-undo/ckeditor5-metadata.json b/packages/ckeditor5-undo/ckeditor5-metadata.json
new file mode 100644
index 00000000000..6787ee1b42a
--- /dev/null
+++ b/packages/ckeditor5-undo/ckeditor5-metadata.json
@@ -0,0 +1,23 @@
+{
+	"plugins": [
+		{
+			"name": "Undo",
+			"className": "Undo",
+			"description": "Support the undo and redo functionalities.",
+			"docs": "features/undo-redo.html",
+			"path": "src/undo.js",
+			"uiComponents": [
+				{
+					"type": "Button",
+					"name": "undo",
+					"iconPath": "@ckeditor/ckeditor5-undo/theme/icons/undo.svg"
+				},
+				{
+					"type": "Button",
+					"name": "redo",
+					"iconPath": "@ckeditor/ckeditor5-undo/theme/icons/redo.svg"
+				}
+			]
+		}
+	]
+}
diff --git a/scripts/ci/validate-metadata-files.js b/scripts/ci/validate-metadata-files.js
index 7172a909d1f..0532a1d77bf 100644
--- a/scripts/ci/validate-metadata-files.js
+++ b/scripts/ci/validate-metadata-files.js
@@ -145,9 +145,17 @@ function getMissingExports( packageData ) {
 function getMissingIcons( packageData, options ) {
 	return packageData.metadata.plugins
 		.filter( plugin => plugin.uiComponents )
-		.flatMap( plugin => plugin.uiComponents.map( uiComponent => uiComponent.iconPath ) )
-		.filter( Boolean )
-		.map( iconPath => {
+		.flatMap( plugin => plugin.uiComponents.map( uiComponent => ( {
+			...plugin,
+			iconPath: uiComponent.iconPath,
+			uiComponentName: uiComponent.name
+		} ) ) )
+		.filter( ( { iconPath } ) => iconPath !== undefined )
+		.map( ( { iconPath, name, uiComponentName } ) => {
+			if ( iconPath === '' ) {
+				return `${ name } (\`${ uiComponentName }\`) has an empty \`iconPath\` value. Either define or remove it.`;
+			}
+
 			if ( iconPath.startsWith( '@ckeditor/' ) ) {
 				return iconPath;
 			}