srkukarni commented on a change in pull request #1357: Pulsar Functions 
documentation follow-up
URL: https://github.com/apache/incubator-pulsar/pull/1357#discussion_r172999261
 
 

 ##########
 File path: site/docs/latest/functions/api.md
 ##########
 @@ -2,9 +2,70 @@
 title: The Pulsar Functions API
 ---
 
+Pulsar Functions provides an easy-to-use API that develoeprs can use to 
+
+## Core programming model
+
+Pulsar Functions
+
+### Source and sink topics
+
+All Pulsar Functions have one or more **source topics** that supply messages 
to the function.
+
+### Sink topic
+
+At the moment, Pulsar Functions can have at most one **sink topic** to which 
processing results are published.
+
 
 Review comment:
   You can add that inside the function logic, it can specifically publish to 
as many topics as it wants.

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