diff --git a/src/controller/testsuite/test.c b/src/controller/testsuite/test.c
index 1bf6bbbe..45a45195 100644
--- a/src/controller/testsuite/test.c
+++ b/src/controller/testsuite/test.c
@@ -607,9 +607,12 @@ static const char USAGE_JOBRUN_TAIL[] =
 static const char USAGE_JOBSUB_HEAD[] =
     "jobsub -u <user> -q <queue> -c <cmdline> [-R <resreq>]\n"
     "       [-n <min>[,<max>]] [-x <exdata>] [-a <arraysize>]\n"
-    "  Submits a new job to the cluster under the given user and queue;\n"
-    "  -x's exdata JSON, when given, overrides the command's built-in\n"
-    "  PATH env instead of the default.\n";
+    "  Submits a new job to the cluster under the given user and queue.\n"
+    "  -n accepts either a single task count, or a comma-separated\n"
+    "  <min>,<max> pair to request an elastic task count the scheduler\n"
+    "  may dispatch anywhere in that range; -x's exdata JSON, when\n"
+    "  given, overrides the command's built-in PATH env instead of the\n"
+    "  default.\n";
 
 static const char USAGE_JOBSUB_TAIL[] =
     "  On success, captures the submitted JobId into the $jobid\n"