diff --git a/README.md b/README.md
index 4673f01f1..96e201ac1 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,7 @@ If you'd like to make https requests, you can enable the `ssl` feature, which
 also lets you install the `pip` package manager. Note that on Windows, you may
 need to install OpenSSL, or you can enable the `ssl-vendor` feature instead,
 which compiles OpenSSL for you but requires a C compiler, perl, and `make`.
+OpenSSL version 3 is expected and tested in CI. Older versions may not work.
 
 Once you've installed rustpython with SSL support, you can install pip by
 running: