flag is another name for the sticky bit.
executable bit is not set.
@item t
-If the sticky bit and the other-executable bit are both set.
+If the restricted deletion flag or sticky bit, and the
+other-executable bit, are both set. The restricted deletion flag is
+another name for the sticky bit. @xref{Mode Structure}.
@item T
-If the sticky bit is set but the other-executable bit is not set.
+If the restricted deletion flag or sticky bit is set but the
+other-executable bit is not set.
@item x
If the executable bit is set and none of the above apply.