diff --git a/APKBUILD.5 b/APKBUILD.5
index 3f19b44..066b3d1 100644
--- a/APKBUILD.5
+++ b/APKBUILD.5
@@ -326,6 +326,10 @@ should use the
 argument to
 .Xr scanelf 1
 when attempting to find shared library (.so) dependencies for the package.
+.It Cm lib64
+Specifies that the package installs files under /lib64 or /usr/lib64 and
+that the test for those directories should be skipped. This is discouraged
+and should only be used for packages providing compatibility for GNU libc.
 .It Cm libtool
 Specifies that the package requires its libtool (.la) files.
 They will not be automatically removed by