From b0f44ad69129f0533317f5bcdd8d7dea1556cd8e Mon Sep 17 00:00:00 2001
From: Joel Bernstein <jbernste@apache.org>
Date: Thu, 1 Jun 2017 15:56:05 -0400
Subject: [PATCH] SOLR-10504: Add documentation

---
 solr/solr-ref-guide/src/stream-sources.adoc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/solr/solr-ref-guide/src/stream-sources.adoc b/solr/solr-ref-guide/src/stream-sources.adoc
index ad91eb37525..fcd006ca4d1 100644
--- a/solr/solr-ref-guide/src/stream-sources.adoc
+++ b/solr/solr-ref-guide/src/stream-sources.adoc
@@ -113,7 +113,14 @@ jdbc(
 ----
 
 == echo
-//TODO
+
+The `echo` function returns a single Tuple echoing its text parameter. `Echo` is the simplest stream source designed to provide text
+to a text analyzing stream decorator.
+
+[source,text]
+----
+echo("Hello world")
+----
 
 == facet