diff --git a/doc/src/sgml/func/func-matching.sgml b/doc/src/sgml/func/func-matching.sgml
index 91a0b7ca0de..f466860ddb0 100644
--- a/doc/src/sgml/func/func-matching.sgml
+++ b/doc/src/sgml/func/func-matching.sgml
@@ -369,11 +369,11 @@
regular expression pattern. The function can be written according
to standard SQL syntax:
-substring(string similar pattern escape escape-character)
+substring(string SIMILAR pattern ESCAPE escape-character)
or using the now obsolete SQL:1999 syntax:
-substring(string from pattern for escape-character)
+substring(string FROM pattern FOR escape-character)
or as a plain three-argument function: