add presentation section to rationale
@@ -50,3 +50,13 @@ Markup based documentation is widely used as well
* open source projects (ReactJS, Pandas, Spark)
* technical books (O'Reilly, Manning)
* big companies (Google, FaceBook)
+
+# Presentations
+
+We build presentations to
+* show new features
+* teach a class
+
+There is a cost to maintain them.
+Instead of building separate slides and keep them up-to-date,
+this system automatically generates slides from your documentation content.
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