diff --git a/src/mom.sol b/src/mom.sol
index ebdd3f0..275e3d4 100644
--- a/src/mom.sol
+++ b/src/mom.sol
@@ -95,4 +95,7 @@ contract SaiMom is DSThing {
         require(ray > 9998 * 10 ** 23);
         vox.mold("way", ray);
     }
+    function setHow(uint ray) public note auth {
+        vox.tune(ray);
+    }
 }
diff --git a/src/sai.t.sol b/src/sai.t.sol
index 6e0e89f..e27b31c 100644
--- a/src/sai.t.sol
+++ b/src/sai.t.sol
@@ -270,6 +270,11 @@ contract SaiTubTest is SaiTestBase {
         assertTrue( mom.call(setAxe, ray(2 ether)));
         assertTrue(!mom.call(setMat, ray(1 ether)));
     }
+    function testTune() public {
+        assertEq(vox.how(), 0);
+        mom.setHow(2 * 10 ** 25);
+        assertEq(vox.how(), 2 * 10 ** 25);
+    }
     function testPriceFeedSetters() public {
         var setPip = bytes4(keccak256('setPip(address)'));
         var setPep = bytes4(keccak256('setPep(address)'));