diff --git a/docs/asciidoc/inc_kinds.asciidoc b/docs/asciidoc/inc_kinds.asciidoc
index 188991c1..f9a8fcd6 100644
--- a/docs/asciidoc/inc_kinds.asciidoc
+++ b/docs/asciidoc/inc_kinds.asciidoc
@@ -21,6 +21,8 @@ To match all indices _except_ those starting with `logstash-`:
  exclude: True
 -------------
 
+Note: Internally _regex_ pattern is constructed from prefix value as `^{0}.*$`. Special characters should be escaped with backslash to match literally.
+
 === suffix
 
 To match all indices ending with `-prod`:
@@ -42,6 +44,8 @@ To match all indices _except_ those ending with `-prod`:
  exclude: True
 -------------
 
+Note: Internally _regex_ pattern is constructed from suffix value as `^.*{0}$`. Specials character should be escaped with backslash to match literally.
+
 === timestring
 
 IMPORTANT: No age calculation takes place here. It is strictly a pattern match.