From f40f2abe78ffddbda3518690ac42ebd57c98b463 Mon Sep 17 00:00:00 2001
From: Eetu Tuomala <laardee@outlook.com>
Date: Mon, 20 Aug 2018 01:15:24 +0300
Subject: [PATCH] add documentation

---
 docs/providers/aws/events/sns.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/docs/providers/aws/events/sns.md b/docs/providers/aws/events/sns.md
index 2dd1b2d09..ccaf019cc 100644
--- a/docs/providers/aws/events/sns.md
+++ b/docs/providers/aws/events/sns.md
@@ -95,3 +95,20 @@ functions:
           topicName: aggregate
           displayName: Data aggregation pipeline
 ```
+
+## Setting a filter policy
+
+This event definition creates an SNS topic which subscription uses a filter policy. The filter policy filters out messages that don't have attribute key `pet` with value `dog` or `cat`.
+
+```yml
+functions:
+  pets:
+    handler: pets.handler
+    events:
+      - sns:
+          topicName: pets
+          filterPolicy:
+            pet:
+              - dog
+              - cat
+```