diff --git a/man/pdp_as.6 b/man/pdp_as.6
index 1ec6d1dcd..c63a076b4 100644
--- a/man/pdp_as.6
+++ b/man/pdp_as.6
@@ -139,3 +139,5 @@ PDP11/60 processor handbook, Digital Equipment Corporation, 1977
 .SH BUGS
 You cannot use *reg in place of (reg). Likewise *(reg) is not understood as
 *0(reg).
+.PP
+Expressions are computed in two bytes, even the ones in .data4 lists.