Siberian chiffchaff breeds in Siberia east of the Pechora River and winters in the lower Himalayas.

[2] It is also regularly recorded in western Europe in winter, and it is likely that the numbers involved have been underestimated due to uncertainties over identification criteria, lack of good data and recording policies (Sweden and Finland only accept trapped birds).

[4] A Gambell, Alaska bird discovered by Alexander Lin-Moore and Ethan Goodman on June 5, 2015 and seen by many birders would be the 4th (or 5th?)

[5] It is a dull bird, grey or brownish above and whitish below, with little yellow in the plumage, and the buff-white supercilium is often longer than in the western subspecies.

[6] It is sometimes considered to be a full species due to its distinctive plumage and vocalisations, being similar to P. s. sindianus in these respects.