diff --git a/man8/ld.so.8 b/man8/ld.so.8
index 2bc77ba08..5e63b9d8c 100644
--- a/man8/ld.so.8
+++ b/man8/ld.so.8
@@ -182,6 +182,9 @@ prints all debugging information it has, if set to
 .B help
 prints a help message about which categories can be specified in this
 environment variable.
+Since glibc 2.3.4,
+.B LD_DEBUG
+is ignored for set-user-ID/set-group-ID binaries.
 .TP
 .B LD_DEBUG_OUTPUT
 (glibc since 2.1)