diff --git a/WrapperApp.md b/WrapperApp.md
index da87e3f..710d394 100644
--- a/WrapperApp.md
+++ b/WrapperApp.md
@@ -171,10 +171,16 @@ The wrapper has the following command-line options:
 
  **--device N**: macro-substitute N for **$GPU_DEVICE_NUM**
    in worker command lines and environment variables.
+
  **--nthreads X**: macro-substitute X for **$NTHREADS**
    in worker command lines and environment variables.
+
  **--trickle X**: send a trickle-up message reporting runtime every X seconds.
 
+ **--use_tstp**: (Unix) use the SIGTSTP signal instead of SIGSTOP to pause processes.
+  SIGTSTP can be caught; SIGSTOP cannot.
+  Use this if the wrapper program is itself a wrapper and handlers SIGTSTP.
+
 ## Example
 
 Assume you have an executable program for a particular platform