diff --git a/src/ScreensaverPlugin.hpp b/src/ScreensaverPlugin.hpp
index e1a0099..8f77403 100644
--- a/src/ScreensaverPlugin.hpp
+++ b/src/ScreensaverPlugin.hpp
@@ -20,7 +20,8 @@ class ScreensaverPlugin {
         virtual void setup(cairo_t* context, const cairo_rectangle_t& rect);
         virtual int fps() const;
 
-        virtual void draw_frame() = 0;
+        virtual void update() = 0; // advance state for next frame
+        virtual void render() = 0; // draw next frame
 
     protected:
         cairo_t* _c {nullptr};