diff --git a/ha-manager.adoc b/ha-manager.adoc
index 793515e..2b4ffcb 100644
--- a/ha-manager.adoc
+++ b/ha-manager.adoc
@@ -296,11 +296,16 @@ the list of resources managed by `ha-manager`. A resource configuration
 inside that list look like this:
 
 ----
-<sid>:
+<type>:<name>
 	<property> <value>
 	...
 ----
 
+It starts with a resource type followed by a resource specific name,
+separated with colon. Together this forms the HA resource ID, which is
+used by all `ha-manager` commands to uniquely identify a resource
+(example: `vm:100` or `ct:101`).
+
 It starts with the service ID followed by a collon. The next lines
 contain additional properties: