diff --git a/man8/ld.so.8 b/man8/ld.so.8
index 41e78c042..db4600fa2 100644
--- a/man8/ld.so.8
+++ b/man8/ld.so.8
@@ -252,6 +252,9 @@ Path where the binary is found (for non-set-user-ID programs).
 .B LD_DYNAMIC_WEAK
 (glibc since 2.1.91)
 Allow weak symbols to be overridden (reverting to old glibc behavior).
+For security reasons, since glibc 2.3.4,
+.B LD_DYNAMIC_WEAK
+is ignored for set-user-ID/set-group-ID binaries.
 .TP
 .B LD_KEEPDIR
 (a.out only)(libc5)