diff --git a/docs/reference/indices.asciidoc b/docs/reference/indices.asciidoc
index da41ac52df5..33ca9a48501 100644
--- a/docs/reference/indices.asciidoc
+++ b/docs/reference/indices.asciidoc
@@ -112,5 +112,7 @@ include::indices/refresh.asciidoc[]
 
 include::indices/forcemerge.asciidoc[]
 
+include::indices/optimize.asciidoc[]
+
 include::indices/upgrade.asciidoc[]