--- a/absyntax/absyntax.def	Mon Feb 24 22:00:55 2014 +0000
+++ b/absyntax/absyntax.def	Sun Mar 02 16:42:56 2014 +0000
@@ -1090,6 +1090,7 @@
 /***********************/
 /* B 3.1 - Expressions */
 /***********************/
+SYM_REF1(ref_expression_c, exp)  /* an extension to the IEC 61131-3 standard - based on the IEC 61131-3 v3 standard. Returns address of the varible! */
 SYM_REF2(or_expression_c, l_exp, r_exp)
 SYM_REF2(xor_expression_c, l_exp, r_exp)
 SYM_REF2(and_expression_c, l_exp, r_exp)