diff --git a/test/gtest_solve_problem_force_torque_inertial_dynamics.cpp b/test/gtest_solve_problem_force_torque_inertial_dynamics.cpp
index c8b24970d62bf12657f48ea1467364bbf68a7542..f152da894d0e67cf3f6ba18da5289859b7263e72 100644
--- a/test/gtest_solve_problem_force_torque_inertial_dynamics.cpp
+++ b/test/gtest_solve_problem_force_torque_inertial_dynamics.cpp
@@ -271,7 +271,7 @@ TEST_F(Test_SolveProblemForceTorqueInertialPreintDynamics_yaml, mass_and_cdm_hov
 
 
     ASSERT_NEAR(mass_estimated, mass_true, 1e-6);
-    ASSERT_MATRIX_APPROX(cdm_estimated.head(2), cdm_true.head(2), 1e-6); // cdm_z is not observable
+    ASSERT_MATRIX_APPROX(cdm_estimated.head(2), cdm_true.head(2), 1e-6); // cdm_z is not observable while hovering
 }
 
 int main(int argc, char **argv)
@@ -279,4 +279,4 @@ int main(int argc, char **argv)
     testing::InitGoogleTest(&argc, argv);
     // ::testing::GTEST_FLAG(filter) = "Test_SolveProblemForceTorqueInertialPreintDynamics_yaml.mass_and_cdm_hovering";
     return RUN_ALL_TESTS();
-}
\ No newline at end of file
+}