diff --git a/src/SoftRobots/component/constraint/JointConstraint.cpp b/src/SoftRobots/component/constraint/JointConstraint.cpp
index 6ee33254..c97ae959 100644
--- a/src/SoftRobots/component/constraint/JointConstraint.cpp
+++ b/src/SoftRobots/component/constraint/JointConstraint.cpp
@@ -108,7 +108,7 @@ void JointForceConstraintResolution::resolution(int line, double** w, double* d,
 
 
 ////////////////////////////////////////////    FACTORY    //////////////////////////////////////////////
-int JointConstraintClass = RegisterObject("Simulate a Force Applied on a Joint (Vec1)")
+int JointConstraintClass = RegisterObject("Lagrange multiplier approach to apply a force/angle on a Joint (Vec1)")
 .add< JointConstraint<Vec1Types> >(true)
 ;
 ////////////////////////////////////////////////////////////////////////////////////////////////////////
diff --git a/src/SoftRobots/component/constraint/JointConstraint.h b/src/SoftRobots/component/constraint/JointConstraint.h
index f0248cb3..7b9fa5c5 100644
--- a/src/SoftRobots/component/constraint/JointConstraint.h
+++ b/src/SoftRobots/component/constraint/JointConstraint.h
@@ -177,9 +177,9 @@ class JointConstraint : public SoftRobotsConstraint<DataTypes>
     void setUpForceLimits(double& imposedValue, double& minDisplacement, double& maxDisplacement);
 };
 
-// #if !defined(SOFTROBOTS_JOINTCONSTRAINT_CPP)
-// extern template class SOFA_SOFTROBOTS_API JointConstraint<sofa::defaulttype::Vec1Types>;
-// #endif
+#if !defined(SOFTROBOTS_JOINTCONSTRAINT_CPP)
+extern template class SOFA_SOFTROBOTS_API JointConstraint<sofa::defaulttype::Vec1Types>;
+#endif
 
 
 } // namespace