Small fix to README.

README.md

@@ -61,7 +61,7 @@ See the test directory for detailed examples. Some simple examples are included
 	Dcmf dcm2(AxisAngle(1, 2, 3));
 	
 	// use axis angle with axis/angle separated to init DCM
-	Dcmf dcm2(AxisAngle(Vector3f(1, 0, 0), 0.2));
+	Dcmf dcm3(AxisAngle(Vector3f(1, 0, 0), 0.2));
 
 	// do some kalman filtering
 	const size_t n_x = 5;