Add some note in the ppx doc.

ocsigen · Jan 18, 2016 · 807d25e · 807d25e
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commit 807d25e
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diff --git a/ppx/ppx_lwt.mli b/ppx/ppx_lwt.mli
@@ -25,6 +25,11 @@
 
 (** {2 Ppx extensions}
 
+    This Ppx extension adds various syntactic shortcut for lwt programming.
+    It needs OCaml >= 4.02 and {{:https://github.com/alainfrisch/ppx_tools}ppx_tools}.
+
+    To use it, simply use the ocamlfind package [lwt.ppx].
+
    This extension adds the following syntax:
 
    - lwt-binding: