diff --git a/doc/index.md b/doc/index.md
index e904871..79f7c24 100644
--- a/doc/index.md
+++ b/doc/index.md
@@ -106,6 +106,17 @@ is the Super key. For me this matches how Emacs does it, but I would
 welcome reports of machines/setups that don't act ths way
 
 
+## Fennel style
+
+https://fennel-lang.org/style is my style bible, although there are
+places I have departed from it. In particular, I have used CamelCase
+to name several modules which act as classes, so that I can
+distinguish `buffer` (an object which represents a buffer, and
+understands messages like `visit` or `name` or `location`) from
+`Buffer` (the factory which instantiates `buffer` objects). There is
+probably a nicer way to do this, but I haven't found it yet.
+
+
 ## Contributing
 
 If you like (or see the potential in) Dunlin enough to want to