diff --git a/README.rst b/README.rst
index 18b2a414..5194be1f 100644
--- a/README.rst
+++ b/README.rst
@@ -48,7 +48,7 @@ Essential dependencies (incomplete list):
 - autoconf/autotools (for libass)
 - X development headers (xlib, X extensions, vdpau, GL, Xv, ...)
 - Audio output development headers (libasound, pulseaudio)
-- fribidi, freetype, fontconfig development headers (for libass)
+- fribidi, freetype, fontconfig, harfbuzz development headers (for libass)
 - libjpeg
 - OpenSSL or GnuTLS development headers if you want to open https links
   (this is also needed to make youtube-dl interaction work)