It was first collected by Allan Octavian Hume in the Sutlej Valley near Rampoor , Himachal Pradesh , India on 13 November 1867 and was initially believed to be an aberrant Clamorous Reed Warbler ( '' Acrocephalus stentoreus '' ) .
It was first collected by Allan Octavian Hume in the Sutlej Valley near Rampoor , Himachal Pradesh , India on 13 November 1867 . 
 The identity of the species was in question and until 2002 was considered as a synonym of the Clamorous Reed Warbler ( '' Acrocephalus stentoreus '' ) .