diff --git a/README.md b/README.md
index b56e4ad..9edb44f 100644
--- a/README.md
+++ b/README.md
@@ -17,9 +17,12 @@ It supports Python 3 and Anki 2.1.
 Installing
 ----------
 
-0. Install Anki. The server currently works well with 2.1.1. If for some reason
-   you can't get this version easily on your system, you can use `anki-bundled`
-   from this repo:
+0. Install Anki. The server currently works well with 2.1.1. Running the server
+   with other versions might work, but things might break, so do it at your own
+   risk. Anki 2.0.x definitely isn't going to work, as it's written in Python 2,
+   whereas `ankisyncd` runs only on Python 3 and later. If for some reason you
+   can't get the supported version easily on your system, you can use
+   `anki-bundled` from this repo:
 
         $ git submodule update --init
         $ cd anki