diff --git a/README.md b/README.md
index a3210a3fd101d5ecbc62dc1952eb5faba8769c34..654153846abd4e64b3a392905edd76bf983e84e0 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,8 @@ There are two ways to install Flamenco Worker:
 - If you have a distributable zip file (see [Packaging for distribution](#packaging-for-distribution))
   unzip it, `cd` into it, then run `./flamenco-worker` (or `flamenco-worker.exe` on Windows).
 
-- If you have a copy of the source files, run `pip3 install -e .` then run `flamenco-worker`.
+- If you have a copy of the source files, run `pip3 install -e .` then run `flamenco-worker`. This
+  requires Python 3.5.2 or newer.
 
 
 ## Configuration