diff --git a/man8/ld.so.8 b/man8/ld.so.8
index d60792d21..10675ac5d 100644
--- a/man8/ld.so.8
+++ b/man8/ld.so.8
@@ -108,8 +108,18 @@ This facilitates the creation of "turn-key" applications that
 do not need to be installed into special directories,
 but can instead be unpacked into any directory
 and still find their own shared libraries.
-.\" ld.so also understands $LIB, with the same meaning as $ORIGIN/lib,
-.\" it appears.
+.TP
+.IR $LIB " (or equivalently " ${LIB} )
+This expands to
+.I lib
+or
+.I lib64
+depending on the architecture
+(e.g., on x86-64, it expands to
+.IR lib64
+and
+on x86-32, it expands to
+.IR lib ).
 .\"
 .\" There is also $PLATFORM.  This is a kind of wildcard
 .\" of directories related to AT_PLATFORM.  To get an idea of the