diff --git a/docs/en/observability/synthetics-private-location.asciidoc b/docs/en/observability/synthetics-private-location.asciidoc
index 668f69c706..0f4b77b0e6 100644
--- a/docs/en/observability/synthetics-private-location.asciidoc
+++ b/docs/en/observability/synthetics-private-location.asciidoc
@@ -75,6 +75,11 @@ For monitors running on {private-location}s, you _must_ use the `elastic-agent-c
 Docker image to create a self-hosted {agent} node. The standard {ecloud} or self-hosted
 {agent} will not work.
 
+[IMPORTANT]
+====
+The `elastic-agent-complete` Docker image is the only way to have all available options that you see in the {ecloud}.
+====
+
 ifeval::["{release-state}"=="unreleased"]
 
 Version {version} has not yet been released.