diff --git a/README.md b/README.md
index 6f8d180..1cfe49a 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,11 @@ Compiling the LaTeX requires both a LaTeX compiler, and packages
 `preview` and `standalone`. Options can be viewed by running
 `./infernal --help`.
 
+## Tests
+
+Please ignore the `/tests` folder. It is very old, and unsupported,
+but kept for archival purposes.
+
 ## License ##
 
 License is `beerware`: