Light accident in guardrail without damage but with police

Hello dear community, I had an accident 3 weeks ago with my car (only liability) by a guardrail at a motorway driveway gently braked me. As far as gentle as I have come to stand at the guardrail with relatively little speed and favorable angles. The guardrail therefore did not suffer any deformations or damage except a few paint tracks of my car. However, the police were on site and wrote me an accident notice which I at the insurance company So my question, is it necessary to inform the insurance company about this? Will the insurance company immediately increase my contribution or will it wait for an invoice (if at all) of the roadmasters’ shop? If an invoice comes then this will certainly be sent to my residential address first? I am relatively unsure what the right way will be for me.