diff --git a/Stream.h b/Stream.h
index 671289e..d595122 100644
--- a/Stream.h
+++ b/Stream.h
@@ -23,6 +23,7 @@ class Stream
     virtual void mul() = 0;
     virtual void add() = 0;
     virtual void triad() = 0;
+    virtual T dot() = 0;
 
     // Copy memory between host and device
     virtual void write_arrays(const std::vector<T>& a, const std::vector<T>& b, const std::vector<T>& c) = 0;