diff --git a/docs/reference/migration/migrate_6_0/indices.asciidoc b/docs/reference/migration/migrate_6_0/indices.asciidoc
index 3c1c0379144..922ff5b17d4 100644
--- a/docs/reference/migration/migrate_6_0/indices.asciidoc
+++ b/docs/reference/migration/migrate_6_0/indices.asciidoc
@@ -63,8 +63,8 @@ The index parameter in the delete index API no longer accepts alias names.
 Instead, it accepts only index names (or wildcards which will expand to
 matching indices).
 
-==== Support for '+' has been removed in index expressions
+==== Support for `+` has been removed in index expressions
 
-Omitting the '+' has the same effect as specifying it, hence support for '+'
+Omitting the `+` has the same effect as specifying it, hence support for `+`
 has been removed in index expressions.