Police are hunting a man who exposed himself to a woman as she walked home from work in Alfreton.
The 51-year-old woman had left work and was walking along Pease Hill just after midnight when she became aware of a man walking behind her.
She stopped to let the man walk past but he indecently exposed himself to her before turning and walking away.
The man is white around 6ft tall. He wore a black hooded top with the hood up.
The incident happened on Saturday, June 23, police have said this week.
Anyone with information should call police on 101 or Crimestoppers on 0800 555 111.