diff --git a/extension.json b/extension.json
index f229b60211..76db67501f 100644
--- a/extension.json
+++ b/extension.json
@@ -2203,6 +2203,7 @@
 				"visualeditor-dialog-transclusion-add-wikitext",
 				"visualeditor-dialog-transclusion-add-param",
 				"visualeditor-dialog-transclusion-add-param-help",
+				"visualeditor-dialog-transclusion-add-param-placeholder",
 				"visualeditor-dialog-transclusion-add-param-save",
 				"visualeditor-dialog-transclusion-add-template",
 				"visualeditor-dialog-transclusion-add-undocumented-param",
diff --git a/i18n/ve-mw/en.json b/i18n/ve-mw/en.json
index fb68d72453..60d17b936a 100644
--- a/i18n/ve-mw/en.json
+++ b/i18n/ve-mw/en.json
@@ -174,7 +174,8 @@
 	"visualeditor-dialog-transclusion-add-content": "Add content",
 	"visualeditor-dialog-transclusion-add-wikitext": "Add wikitext",
 	"visualeditor-dialog-transclusion-add-param": "Add more information",
-	"visualeditor-dialog-transclusion-add-param-help": "If known, enter undocumented parameter names. If the parameter is not already part of the template, adding it will have no effect. You may find information about existing parameters on the [[$1|template's page]].",
+	"visualeditor-dialog-transclusion-add-param-help": "If known, enter undocumented parameter names. Note that only parameters known by the template will have an effect. You may find information about existing parameters on the [[$1|template's page]].",
+	"visualeditor-dialog-transclusion-add-param-placeholder": "Parameter name",
 	"visualeditor-dialog-transclusion-add-param-save": "Add parameter",
 	"visualeditor-dialog-transclusion-add-template": "Add template",
 	"visualeditor-dialog-transclusion-add-undocumented-param": "Add undocumented parameter",
diff --git a/i18n/ve-mw/qqq.json b/i18n/ve-mw/qqq.json
index deac7ccad9..d6f71b08f5 100644
--- a/i18n/ve-mw/qqq.json
+++ b/i18n/ve-mw/qqq.json
@@ -193,6 +193,7 @@
 	"visualeditor-dialog-transclusion-add-wikitext": "Label for button that adds parameter wikitext to a transclusion.",
 	"visualeditor-dialog-transclusion-add-param": "Label for button that adds a parameter to a transcluded template.",
 	"visualeditor-dialog-transclusion-add-param-help": "Help text for new undocumented parameter input field.\n\nParameters:\n* $1 - The title of the template.",
+	"visualeditor-dialog-transclusion-add-param-placeholder": "Placeholder in the input field that adds a new undocumented parameter to a transcluded template.",
 	"visualeditor-dialog-transclusion-add-param-save": "Label for save button that adds a new undocumented parameter to a transcluded template.",
 	"visualeditor-dialog-transclusion-add-template": "Label for button that adds the specified template to the page.\n{{Identical|Add template}}",
 	"visualeditor-dialog-transclusion-add-undocumented-param": "Label for button that adds a new undocumented parameter to a transcluded template.",
diff --git a/modules/ve-mw/ui/pages/ve.ui.MWAddParameterPage.js b/modules/ve-mw/ui/pages/ve.ui.MWAddParameterPage.js
index 70673f81fc..6ae7b8b914 100644
--- a/modules/ve-mw/ui/pages/ve.ui.MWAddParameterPage.js
+++ b/modules/ve-mw/ui/pages/ve.ui.MWAddParameterPage.js
@@ -32,7 +32,10 @@ ve.ui.MWAddParameterPage = function VeUiMWAddParameterPage( parameter, name, con
 		.connect( this, { click: 'togglePlaceholder' } );
 
 	// Input field and button
-	this.paramInputField = new OO.ui.TextInputWidget().connect( this, { enter: 'onParameterInput' } );
+	this.paramInputField = new OO.ui.TextInputWidget( {
+		placeholder: ve.msg( 'visualeditor-dialog-transclusion-add-param-placeholder' )
+	} )
+		.connect( this, { enter: 'onParameterInput' } );
 	var saveButton = new OO.ui.ButtonWidget( {
 		label: ve.msg( 'visualeditor-dialog-transclusion-add-param-save' ),
 		flags: [ 'primary', 'progressive' ]
@@ -45,17 +48,20 @@ ve.ui.MWAddParameterPage = function VeUiMWAddParameterPage( parameter, name, con
 		{ classes: [ 've-ui-mwTransclusionDialog-addParameterFieldset-input' ] }
 	);
 
+	var $helpText = mw.message(
+		'visualeditor-dialog-transclusion-add-param-help',
+		this.template.getTitle() || this.template.getTarget().wt
+	).parseDom();
 	this.addParameterFieldset = new OO.ui.FieldsetLayout( {
 		label: this.addParameterInputHeader.$element,
 		helpInline: true,
-		help: mw.message(
-			'visualeditor-dialog-transclusion-add-param-help',
-			this.template.getTitle() || this.template.getTarget().wt
-		).parseDom(),
+		help: $helpText,
 		classes: [ 've-ui-mwTransclusionDialog-addParameterFieldset' ],
 		$content: this.addParameterInputField.$element
 	} );
 
+	ve.targetLinksToNewWindow( this.addParameterFieldset.$element[ 0 ] );
+
 	// Init visibility
 	this.togglePlaceholder( false );