diff --git a/reference/pgsql/functions/pg-escape-identifier.xml b/reference/pgsql/functions/pg-escape-identifier.xml
index 58144ec94c..5ef0a429e9 100644
--- a/reference/pgsql/functions/pg-escape-identifier.xml
+++ b/reference/pgsql/functions/pg-escape-identifier.xml
@@ -25,7 +25,7 @@
    quotes. Use of this function is recommended for identifier
    parameters in query. For SQL literals (i.e. parameters except
    bytea), <function>pg_escape_literal</function>
-   or <function>pg_escape_string</function> muse be used. For bytea
+   or <function>pg_escape_string</function> must be used. For bytea
    type fields, <function>pg_escape_bytea</function> must be used
    instead.
   </para>