diff --git a/gtsam/slam/GeneralSFMFactor.h b/gtsam/slam/GeneralSFMFactor.h
index db6f92f8c..cd16f6788 100644
--- a/gtsam/slam/GeneralSFMFactor.h
+++ b/gtsam/slam/GeneralSFMFactor.h
@@ -71,6 +71,11 @@ namespace gtsam {
 			return q.vector() ;
 		}
 
+		/** return the measured */
+		inline const Point2 measured() const {
+			return z_;
+		}
+
 	private:
 		/** Serialization function */
 		friend class boost::serialization::access;