document build-stages directory

diff --git a/guide/hausner/overview.org b/guide/hausner/overview.org
index 031aa2f4e0666cfe06d26d620f3705ee7bc67028..c094de5e8a96b48a7f1ba0cd5d98654c7d1871f3 100644 (file)
--- a/guide/hausner/overview.org
+++ b/guide/hausner/overview.org
@@ -51,3 +51,11 @@
 *** 3d-printables
     the parts of the robot that are 3d-printed are in this directory.
     use openscad to open the parts in this directory.
+*** build-stages
+    all the wiring diagrams and arduino code live in this directory.
+
+    under this directory, there is one subdirectory for each
+    build stage.
+    each build stage is prefixed with a letter to make it appear in
+    order.
+    for example, =a_serial= contains the first build stage.