diff --git a/src/ScreensaverPlugin.hpp b/src/ScreensaverPlugin.hpp
index 33d9d64..e79c167 100644
--- a/src/ScreensaverPlugin.hpp
+++ b/src/ScreensaverPlugin.hpp
@@ -13,6 +13,7 @@ class ScreensaverPlugin {
         virtual void configure();
         virtual int fps() const;
 
+        virtual std::string version() const = 0;
         virtual void update() = 0; // advance state for next frame
         virtual void render() = 0; // draw next frame