diff --git a/include/nuttx/nx/nx.h b/include/nuttx/nx/nx.h
index 3876766331..33b28798cf 100644
--- a/include/nuttx/nx/nx.h
+++ b/include/nuttx/nx/nx.h
@@ -243,7 +243,7 @@ struct nx_callback_s
    *   event - The server event
    *   arg1  - User provided argument (see nx_openwindow, nx_requestbkgd,
    *           nxtk_openwindow, or nxtk_opentoolbar)
-   *   arg2  - User provided argument (see nx_block or nxtk_block)
+   *   arg2  - User provided argument (see nx[tk]_block or nx[tk]_synch)
    *
    * Returned Value:
    *   None
diff --git a/tools/testbuild.sh b/tools/testbuild.sh
index 9d008ce48a..a0ca8a053a 100755
--- a/tools/testbuild.sh
+++ b/tools/testbuild.sh
@@ -48,7 +48,7 @@ unset testfile
 
 function showusage {
     echo ""
-    echo "USAGE: $progname [-w|l] [-c|u|n] [-s] [-a <appsdir>] [-n <nxdir>] <testlist-file>"
+    echo "USAGE: $progname [-w|l] [-c|u|n] [-s] [-d] [-x] [-a <apps-dir>] [-t <nuttx-dir><testlist-file>"
     echo "       $progname -h"
     echo ""
     echo "Where:"
@@ -56,10 +56,10 @@ function showusage {
     echo "  -c|u|n selects Windows environment option:  Cygwin (c), Ubuntu under"
     echo "     Windows 10 (u), or Windows native (n).  Default Cygwin"
     echo "  -s Use C++ unsigned long size_t in new operator. Default unsigned int"
-    echo "  -a <appsdir> provides the relative path to the apps/ directory.  Default ../apps"
-    echo "  -t <topdir> provides the absolute path to top nuttx/ directory.  Default $PWD/../nuttx"
     echo "  -d enables script debug output"
     echo "  -x exit on build failures"
+    echo "  -a <appsdir> provides the relative path to the apps/ directory.  Default ../apps"
+    echo "  -t <topdir> provides the absolute path to top nuttx/ directory.  Default $PWD/../nuttx"
     echo "  -h will show this help test and terminate"
     echo "  <testlist-file> selects the list of configurations to test.  No default"
     echo ""