--- /n/sources/plan9/sys/man/2/exec	Wed Aug 19 16:53:17 2009
+++ /sys/man/2/exec	Wed Aug 17 00:00:00 2016
@@ -198,3 +198,8 @@
 The kernel constant
 .B TSTKSIZ
 controls this.
+.PP
+Both functions rely upon the system's demand paging,
+which in turn expects to be able to read full pages in a single
+.I read
+operation, no matter what the underlying file server is.