diff --git a/README b/README
index 2bc3b1f5f4dc9b32375da102dda973c4d33ff404..b2968b4db58ad9a7d06fc2a464b2388f0a9eb8a7 100644
--- a/README
+++ b/README
@@ -4,6 +4,6 @@ cd to the firefox-esr or thunderbird directory to which you want to
 apply patches, and run /path/to/firefox-patches/build-firefox or
 /path/to/thunderbird-patches/build-thunderbird, for instance:
 
-apt-get source firefox-esr=60.5.1esr-1
+apt-get source firefox-esr=60.5.1esr-1~deb8u1
 cd firefox-esr-*
 /home/me/mozilla/firefox-patches/build-firefox