doc: id: document -a in manual

* doc/coreutils.texi (id invocation): Mention this option is ignored.

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index b31c49d05f798c4e0eb87383a7500d8fef5286fc..6a9fc54389f2001abfd4be0f54d896ed396eba37 100644 (file)
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -15455,6 +15455,9 @@ The options cause @command{id} to print only part of the above information.
 Also see @ref{Common options}.
 
 @table @samp
+@optItem{id,-a,}
+Ignored; for compatibility with other versions of @command{id}.
+
 @optItem{id,-g,}
 @optItemx{id,--group,}
 Print only the group ID.