diff --git a/gtsam/geometry/geometry.i b/gtsam/geometry/geometry.i
index f872283f3..350f23d18 100644
--- a/gtsam/geometry/geometry.i
+++ b/gtsam/geometry/geometry.i
@@ -862,6 +862,7 @@ class Similarity2 {
   static gtsam::Similarity2 Align(const gtsam::Pose2Pairs& abPosePairs);
 
   // Standard Interface
+  bool equals(const gtsam::Similarity2& sim, double tol) const;
   Matrix matrix() const;
   gtsam::Rot2& rotation();
   gtsam::Point2& translation();
@@ -884,6 +885,7 @@ class Similarity3 {
   static gtsam::Similarity3 Align(const gtsam::Pose3Pairs& abPosePairs);
 
   // Standard Interface
+  bool equals(const gtsam::Similarity3& sim, double tol) const;
   Matrix matrix() const;
   gtsam::Rot3& rotation();
   gtsam::Point3& translation();