diff --git a/gtsam/linear/JacobianFactor.h b/gtsam/linear/JacobianFactor.h
index 079cb9292..ec661066d 100644
--- a/gtsam/linear/JacobianFactor.h
+++ b/gtsam/linear/JacobianFactor.h
@@ -289,7 +289,7 @@ namespace gtsam {
 
   private:
 
-    // Friend HessianFactor to facilitate convertion constructors
+    // Friend HessianFactor to facilitate conversion constructors
     friend class HessianFactor;
 
     // Friend unit tests (see also forward declarations above)