diff --git a/README b/README
new file mode 100644
index 0000000..f9c2714
--- /dev/null
+++ b/README
@@ -0,0 +1,11 @@
+You should not use this utility! The GNU Privacy Guard (gpg(1)) is capable of
+retrieving PGP keys from Protonmail using WKD [0]. This also works for some
+other addresses.
+
+Here’s how to do it, using my e-mail address as an example:
+$ gpg --auto-key-locate wkd --locate-keys emma@tebibyte.media
+
+And to import it:
+$ gpg --auto-key-locate wkd --auto-key-import --locate-keys emma@tebibyte.media
+
+[0] https://proton.me/blog/security-updates-2019