diff --git a/templates/lv2/data/manifest.ttl.in b/templates/lv2/data/manifest.ttl.in
index 7ebeef5..3b4838b 100644
--- a/templates/lv2/data/manifest.ttl.in
+++ b/templates/lv2/data/manifest.ttl.in
@@ -125,6 +125,16 @@
 {{=it.tibia.lv2.ttlURI(it.lv2.ui.uri)}}
 	a ui:@UI_TYPE@ ;
 	ui:binary <{{=it.product.bundleName}}@DLL_SUFFIX@> ;
+	lv2:extensionData ui:resize ;
+{{?!it.product.ui.userResizable}}
+	lv2:optionalFeature ui:noUserResize ; # doesn't work as lv2:requiredFeature, don't ask me why
+{{?!it.product.ui.selfResizable}}
+	lv2:optionalFeature ui:fixedSize ;
+{{?}}
+{{?}}
+{{?it.product.ui.selfResizable}}
+	lv2:optionalFeature ui:resize ;
+{{?}}
 	lv2:requiredFeature ui:idleInterface ;
 	lv2:extensionData ui:idleInterface .
 {{?}}
diff --git a/templates/lv2/src/data.h b/templates/lv2/src/data.h
index 158f1e7..2c49854 100644
--- a/templates/lv2/src/data.h
+++ b/templates/lv2/src/data.h
@@ -67,4 +67,5 @@ static uint32_t param_out_index[DATA_PRODUCT_CONTROL_OUTPUTS_N] = {
 
 {{?it.lv2.ui}}
 #define DATA_LV2_UI_URI				"{{=it.tibia.CGetUTF8StringLiteral(it.tibia.lv2.expandURI(it.lv2.ui.uri))}}"
+#define DATA_UI_USER_RESIZABLE			{{=it.product.ui.userResizable ? 1 : 0}}
 {{?}}
diff --git a/templates/lv2/src/lv2.c b/templates/lv2/src/lv2.c
index f2c1fca..d23b010 100644
--- a/templates/lv2/src/lv2.c
+++ b/templates/lv2/src/lv2.c
@@ -308,6 +308,8 @@ static LV2UI_Handle ui_instantiate(const LV2UI_Descriptor * descriptor, const ch
 		if (!strcmp(features[i]->URI, LV2_UI__parent)) {
 			has_parent = 1;
 			parent = features[i]->data;
+		} else if (!strcmp(features[i]->URI, LV2_UI__resize)) {
+			// TODO...
 		}
 
 	plugin_ui *instance = plugin_ui_create(has_parent, parent);
@@ -332,10 +334,23 @@ static int ui_idle(LV2UI_Handle handle) {
 	return 0;
 }
 
+static int ui_resize(LV2UI_Feature_Handle handle, int width, int height) {
+#if DATA_UI_USER_RESIZABLE
+	//TODO
+	//return plugin_ui_resize((plugin_ui *)handle, width, height);
+	return 0;
+#else
+	return -1;
+#endif
+}
+
 static const void * ui_extension_data(const char * uri) {
 	static const LV2UI_Idle_Interface idle = { ui_idle };
+	static const LV2UI_Resize resize = { NULL, ui_resize };
 	if (!strcmp(uri, LV2_UI__idleInterface))
 		return &idle;
+	else if (!strcmp(uri, LV2_UI__resize))
+		return &resize;
 	return NULL;
 }
 
diff --git a/test/plugin.h b/test/plugin.h
index ae5469b..f68c72a 100644
--- a/test/plugin.h
+++ b/test/plugin.h
@@ -151,14 +151,13 @@ static plugin_ui *plugin_ui_create(char has_parent, void *parent) {
 	instance->world = puglNewWorld(PUGL_MODULE, 0);
 	instance->view = puglNewView(instance->world);
 	puglSetSizeHint(instance->view, PUGL_DEFAULT_SIZE, 600, 400);
-	puglSetViewHint(instance->view, PUGL_RESIZABLE, 0);
+	puglSetViewHint(instance->view, PUGL_RESIZABLE, PUGL_TRUE);
 	puglSetBackend(instance->view, puglCairoBackend());
 	PuglRect frame = { 0, 0, 600, 400 };
 	puglSetFrame(instance->view, frame);
 	puglSetEventFunc(instance->view, plugin_ui_on_event);
-	if (has_parent) {
+	if (has_parent)
 		puglSetParentWindow(instance->view, (PuglNativeView)parent);
-	}
 	if (puglRealize(instance->view)) {
 		puglFreeView(instance->view);
 		puglFreeWorld(instance->world);
diff --git a/test/product.json b/test/product.json
index 761c0af..e4a500b 100644
--- a/test/product.json
+++ b/test/product.json
@@ -125,6 +125,10 @@
 				"unit": "",
 				"map": "linear"
 			}
-		]
+		],
+		"ui": {
+			"userResizable": true,
+			"selfResizable": false
+		}
 	}
 }