diff --git a/libbeat/docs/shared-ilm.asciidoc b/libbeat/docs/shared-ilm.asciidoc
index 12069381c2c1..4b96dcdbf276 100644
--- a/libbeat/docs/shared-ilm.asciidoc
+++ b/libbeat/docs/shared-ilm.asciidoc
@@ -66,7 +66,7 @@ Date math is supported in this setting. For example:
 
 [source,yaml]
 ----
-setup.ilm.pattern: "{now/M{YYYY.MM}}-000001"
+setup.ilm.pattern: "{now/M{yyyy.MM}}-000001"
 ----
 
 For more information, see