diff --git a/src/core/public/public.api.md b/src/core/public/public.api.md
index 883b62de50ff..c72e7e32f5f4 100644
--- a/src/core/public/public.api.md
+++ b/src/core/public/public.api.md
@@ -1110,6 +1110,8 @@ export interface OverlayStart {
     //
     // (undocumented)
     openModal: OverlayModalStart['open'];
+    // (undocumented)
+    sidecar: OverlaySidecarStart;
 }
 
 export { PackageInfo }
diff --git a/src/plugins/opensearch_dashboards_react/README.md b/src/plugins/opensearch_dashboards_react/README.md
index bc8bfcf0266c..f5f4cd5efe79 100644
--- a/src/plugins/opensearch_dashboards_react/README.md
+++ b/src/plugins/opensearch_dashboards_react/README.md
@@ -153,6 +153,7 @@ class MyPlugin {
 
 - `overlays.openModal` — opens modal window.
 - `overlays.openFlyout` — opens right side panel.
+- `overlays.sidecar().open` — opens sidecar.
 
 You can access `overlays` service through React context.