The district of Walddorf was first mentioned in a document by Pope Innocent III as Waltdorf.

The district of Walddorf has been authorized to hold fairs since the first quarter of the 18th century at the latest, making it a market town.

For a long time, the actual name document was unknown and people had to rely on the information in the work "Das Königreich Württemberg.

Eine Beschreibung nach Kreisen, Oberämtern und Gemeinden", Stuttgart 1904-1907 (Volume II, page 582), whose authors failed to cite a source.

The document was only found in the Reutlingen town archives shortly before Häslach's 700th anniversary in 2010.