Index: openacs-4/packages/acs-templating/tcl/tag-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-templating/tcl/tag-procs.tcl,v
diff -u -N -r1.21 -r1.22
--- openacs-4/packages/acs-templating/tcl/tag-procs.tcl	7 Aug 2017 23:48:02 -0000	1.21
+++ openacs-4/packages/acs-templating/tcl/tag-procs.tcl	23 Aug 2017 18:09:29 -0000	1.22
@@ -230,6 +230,7 @@
         default { 
             # treat <if @foo_p@> as a shortcut for <if @foo_p@ true>
             #append condition "\[template::util::is_true $arg1\]"
+            ad_log warning "operation <$op> using undocumented <if @foo_p@> as a shortcut for <if @foo_p@ true>"
             append condition "\[string is true -strict $arg1\]"
             set next [expr {$i - 1}]
         }