diff -up man-pages-2.80/man3/malloc_hook.3.pom man-pages-2.80/man3/malloc_hook.3
--- man-pages-2.80/man3/malloc_hook.3.pom 2008-06-03 11:50:24.000000000 +0200
+++ man-pages-2.80/man3/malloc_hook.3 2008-06-11 09:20:59.000000000 +0200
@@ -72,6 +72,12 @@ The variable
points at a function that is called each time after
.BR sbrk (2)
was asked for more memory.
+.LP
+Hook variables are not thread-safe so they are deprecated now.
+Programmers should instead preempt callst to the relevant functions
+by defining and exporting functions like "malloc" and "free".
+
+
.SH "CONFORMING TO"
These functions are GNU extensions.
.SH "EXAMPLE"