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-rw-r--r--apps/tile/README.md11
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diff --git a/apps/tile/README.md b/apps/tile/README.md
index 48fd20ee..a13f7662 100644
--- a/apps/tile/README.md
+++ b/apps/tile/README.md
@@ -20,3 +20,14 @@ To run a conventional REPL (for debugging):
 ```
 ./a.elf type
 ```
+
+## hacking
+
+Unlike the top-level directory, this is just a prototype so far. There are no
+tests.
+
+To add a new primitive you'll need to hard-code it into the `evaluate`
+function (apps/tile/rpn.mu).
+
+There's also a second place you'll want to teach about predefined primitives:
+`bound-function?` (apps/tile/environment.mu)