diff --git a/BUILD.md b/BUILD.md
index 56e599cc..f11b056c 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -9,6 +9,8 @@ Start by getting a copy of the source code:
 
 *For .deb-based distros (like Debian, Ubuntu, Linux Mint):*
 
+Note that python-stem appears in Debian wheezy and newer (so by extension Tails 1.1 and newer), and it appears in Ubuntu 13.10 and newer. Older versions of Debian and Ubuntu aren't supported.
+
     sudo apt-get install -y build-essential fakeroot python-all python-stdeb python-flask python-stem python-webkit
     ./build_deb.sh
     sudo dpkg -i deb_dist/onionshare_*.deb