diff --git a/content_structure/test_guide.md b/content_structure/test_guide.md
index 31450c8..9755241 100644
--- a/content_structure/test_guide.md
+++ b/content_structure/test_guide.md
@@ -24,6 +24,7 @@ The following test scenarios are explained:
 * [T6 External users](#t6-external-users)
 * [T7 Campaigns](#t7-campaigns)
 * [T8 Shared playlists](#t8-shared-playlists)
+* [T9 Feed sources](#t9-feed-sources)
 
 ---
 
@@ -488,3 +489,39 @@ When it is shared it can be displayed in another tenant, but not edited.
 * Test that the playlist is displayed on the screen. See T1 for how to activate the screen.
 
 ---
+
+## T9 Feed sources
+
+### Description
+
+Feed sources are the link between external data source and slides. An example is the RSS feed.
+When creating a slide with the RSS template a feed source ("datakilde") needs to be selected.
+After the feed source has been selected it is possible to input the url to the RSS feed to show data from.
+The feed source contains the code that calls the external source and converts data to a format the RSS template
+understands.
+
+Feed sources are connected to a tenant. New feed sources can be connected to a tenant in through the
+"Datakilde" link in the navigation.
+
+The following guide describes how to add a "calendar api" feed source to a tenant.
+
+NB! The calendar api feed source has some installation requirements that are assumed to have been set up.
+See the [documentation](https://github.com/os2display/display-api-service/blob/develop/docs/calender-api-feed.md) for
+further information.
+
+With the calendar api feed source the administrator should select which locations are connected with the given tenant.
+When creating a slide with the given feed source, the resources that belong to the given locations are available
+to deliver data to the slide.
+
+### Steps
+
+* Go to `/admin/feed-sources/list`.
+* Click "Opret ny datakilde" (`/admin/feed-sources/create`).
+* Select a name (e.g. "My calendar feed") and add a description of the feed source.
+* Select "Kalender feed" for "Type".
+* It will display "Bemærk! Datakilden skal gemmes før der kan tilkobles lokationer. Gem og åbn datakilden igen.".
+* Save with "Gem datakilde".
+* Reopen the feed source from the list.
+* Select locations that should be connected with the given tenant.
+* Save with "Gem datakilde".
+* Now the feed source should be available in the feed selector, when setting up a "calendar" slide.