Document change against the function definition

h2/src/docsrc/help/help.csv

@@ -4296,7 +4296,7 @@ Replaces each substring that matches a regular expression.
 For details, see the Java ""String.replaceAll()"" method.
 If any parameter is null (except optional flagsString parameter), the result is null.
 
-Flags values limited to 'i', 'c', 'n', 'm'. Other symbols causes exception.
+Flags values limited to 'i', 'c', 'n', 'm'. Other symbols causes exception (except for 'g' which is ignored when running in PostgreSQL mode).
 Multiple symbols could be uses in one flagsString parameter (like 'im').
 Later flags overrides first ones, for example 'ic' equivalent to case sensitive matching 'c'.