Index: at.1.in
===================================================================
--- at.1.in
+++ at.1.in	2008-08-15 16:46:44.336420027 +0200
@@ -32,7 +32,10 @@
 and
 .B batch
 read commands from standard input or a specified file which are to
-be executed at a later time, using
+be executed at a later time, using the shell set by the user's environment
+variable
+.BR SHELL,
+the user's login shell, or ultimately
 .BR /bin/sh .
 .TP 8
 .BR at
Index: at.c
===================================================================
--- at.c
+++ at.c	2008-08-15 16:45:34.197420463 +0200
@@ -942,7 +942,7 @@
 	   It also alows a warning diagnostic to be printed.  Because of the
 	   possible variance, we always output the diagnostic. */
 
-	fprintf(stderr, "warning: commands will be executed using /bin/sh\n");
+	fprintf(stderr, "warning: commands will be executed using (in order) a) $SHELL b) login shell c) /bin/sh\n");
 
 	writefile(timer, queue);
 	break;