diff --git a/docs/en/observability/apm/manage-storage/ilm-how-to.asciidoc b/docs/en/observability/apm/manage-storage/ilm-how-to.asciidoc
index 79b6dbad8c..162d9ffe6d 100644
--- a/docs/en/observability/apm/manage-storage/ilm-how-to.asciidoc
+++ b/docs/en/observability/apm/manage-storage/ilm-how-to.asciidoc
@@ -18,7 +18,7 @@ customization for lifecycle.
 
 [NOTE]
 ====
-Some older indices might be managed by {ref}/data-stream-lifecycle.html[data stream lifecycle (DSL)] if cluster is upgraded to 8.17.
+Some older indices might be managed by {ref}/data-stream-lifecycle.html[data stream lifecycle (DSL)] if a cluster is upgraded to 8.17.
 More details are available in <<apm-release-notes>>.
 ====