diff --git a/site/README.md b/site/README.md
index 83650fe..f927db5 100644
--- a/site/README.md
+++ b/site/README.md
@@ -1,3 +1,6 @@
 # gmid website/capsule
 
 These are the sources for the gmid website and Gemini capsule.
+
+Unlike gmid itself, to build the site you'll need OpenBSD' make (on
+linux `bmake` *may* work.)