diff --git a/man1/ldd.1 b/man1/ldd.1
index 958771149..cac49b02a 100644
--- a/man1/ldd.1
+++ b/man1/ldd.1
@@ -29,6 +29,7 @@ Print all information, including e.g. symbol versioning information.
 .TP
 .B \-u\ \-\-unused
 Print unused direct dependencies.
+(Since glibc 2.3.4.)
 .TP
 .B \-d\ \-\-data\-relocs
 Perform relocations and report any missing objects (ELF only).