diff --git a/man8/ld.so.8 b/man8/ld.so.8
index 84278d0..0e6461a 100644
--- a/man8/ld.so.8
+++ b/man8/ld.so.8
@@ -143,6 +143,26 @@ ELF libraries at execution-time.
 Similar to the
 .B PATH
 environment variable.
+
+.B ld.so
+understands the strings
+.I $ORIGIN
+,
+.I $LIB
+and
+.I $PLATFORM
+(or equivalently
+.IR ${var} )
+in a LD_LIBRARY_PATH string.
+
+.B LIB
+is expanded to lib or lib64 based on the architecture.
+
+.B ORIGIN
+is expanded to the location of the binary which is currently loaded.
+
+.B PLATFORM
+is expanded to the running platform.
 .TP
 .B LD_PRELOAD
 A whitespace-separated list of additional, user-specified, ELF shared