--- configs/cdr_pgsql.conf.sample	2010-10-10 01:25:37.000000000 +0200
+++ configs/cdr_pgsql.conf.sample.infoad	2010-12-22 14:30:14.000000000 +0100
@@ -13,3 +13,16 @@
 ;table=cdr		;SQL table where CDRs will be inserted
 ;encoding=LATIN9	; Encoding of logged characters in Asterisk
 ;timezone=UTC		; Uncomment if you want datetime fields in UTC/GMT
+
+; Note that no [columns] section is defined for this backend and
+; no alias can be defined for column names. In order to use a pgsql
+; reserved word like "end", simply define it as a column between quotes
+; for example:
+; CREATE TABLE cdr
+;(
+;  ....
+;  calldate timestamp with time zone,
+;  answer timestamp with time zone,
+;  "end" timestamp with time zone,
+;  .....
+;);