diff --git a/src/bruit.mli b/src/bruit.mli
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--- /dev/null
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+(** {! Bruit} is a port of the C library
+    {{:https://github.com/antirez/linenoise} Linenoise} to OCaml. It is not as
+    feature complete as the library, contributions are very welcome.
+
+    The main entry point to the library is {! bruit}. *)
+
+type result = String of string option | Ctrl_c
+
+val bruit : string -> result
+(** [bruit prompt] reads from [stdin] and returns the read string if any, and on
+    [ctrl+c] returns {! Ctrl_c}. *)