prefork-interp: document -U

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/cprogs/prefork-interp.c b/cprogs/prefork-interp.c
index dfc8aca2e452ad1598f65402928465ebc479a806..a643e43b94b06c00175f3bc414f81b0a549b2f00 100644 (file)
--- a/cprogs/prefork-interp.c
+++ b/cprogs/prefork-interp.c
@@ -6,6 +6,12 @@
  *   prefork-interp  [<option> ..] <interpreter>  [<script> [<args> ...]]
  *   prefork-interp  [<option>,..],<interpreter>   <script> [<args> ...]
  *   prefork-interp '[<option> ..] <interpreter>'  <script> [<args> ...]
+ *
+ * Options must specify argument laundering mode.
+ * Currently the only mode supported is:
+ *   -U    unlaundered: setup and executor both get all arguments and env vars
+ *         ident covers only env vars specified  with -E
+ *         ident covers only arguments interpreter and (if present) script
  */
 /*
  * Process structure: