Tearvertex 2.8.4

Hey, I am currently working on a softbody simulation in physx sdk 2.8.4. I am trying to add tearvertex but when I look in the documentary I only find the following information. Can someone familiar with tearvertex help me on this. Thanks

virtual bool NxSoftBody::tearVertex  ( const NxU32  vertexId,  
  const NxVec3 &  normal   

Go to the SampleSoftBody and turn on

if (desc.flags & NX_SBF_TEARABLE)