diff --git a/configs/README.txt b/configs/README.txt
index 6ccd836642a..17c29286e46 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -256,7 +256,7 @@ defconfig -- This is a configuration file similar to the Linux
 		CONFIG_SCHED_WORKPRIORITY - The execution priority of the worker
 		  thread.  Default: 50
 		CONFIG_SCHED_WORKPERIOD - How often the worker thread checks for
-		  work.  Default: 50 MS.
+		  work in units of microseconds.  Default: 50*1000 (50 MS).
 		CONFIG_SCHED_WORKSTACKSIZE - The stack size allocated for the worker
 		  thread.  Default: CONFIG_IDLETHREAD_STACKSIZE.
 		CONFIG_SIG_SIGWORK - The signal number that will be used to wake-up
diff --git a/configs/stm3210e-eval/RIDE/defconfig b/configs/stm3210e-eval/RIDE/defconfig
index 7e9a52b6424..cc08dc9c012 100755
--- a/configs/stm3210e-eval/RIDE/defconfig
+++ b/configs/stm3210e-eval/RIDE/defconfig
@@ -307,7 +307,7 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_SCHED_WORKPRIORITY - The execution priority of the worker
 #  thread.  Default: 50
 # CONFIG_SCHED_WORKPERIOD - How often the worker thread checks for
-#  work.  Default: 50 MS.
+#  work in units of microseconds.  Default: 50*1000 (50 MS).
 # CONFIG_SCHED_WORKSTACKSIZE - The stack size allocated for the worker
 #  thread.  Default: CONFIG_IDLETHREAD_STACKSIZE.
 # CONFIG_SIG_SIGWORK - The signal number that will be used to wake-up
@@ -340,7 +340,7 @@ CONFIG_SDCLONE_DISABLE=y
 CONFIG_NXFLAT=n
 CONFIG_SCHED_WORKQUEUE=n
 CONFIG_SCHED_WORKPRIORITY=50
-CONFIG_SCHED_WORKPERIOD=50
+CONFIG_SCHED_WORKPERIOD=(50*1000)
 CONFIG_SCHED_WORKSTACKSIZE=1024
 CONFIG_SIG_SIGWORK=4
 
diff --git a/configs/stm3210e-eval/nsh/defconfig b/configs/stm3210e-eval/nsh/defconfig
index 19f682d908c..5a41b5b1ee4 100755
--- a/configs/stm3210e-eval/nsh/defconfig
+++ b/configs/stm3210e-eval/nsh/defconfig
@@ -317,7 +317,7 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_SCHED_WORKPRIORITY - The execution priority of the worker
 #  thread.  Default: 50
 # CONFIG_SCHED_WORKPERIOD - How often the worker thread checks for
-#  work.  Default: 50 MS.
+#  work in units of microseconds.  Default: 50*1000 (50 MS).
 # CONFIG_SCHED_WORKSTACKSIZE - The stack size allocated for the worker
 #  thread.  Default: CONFIG_IDLETHREAD_STACKSIZE.
 # CONFIG_SIG_SIGWORK - The signal number that will be used to wake-up
@@ -349,7 +349,7 @@ CONFIG_SDCLONE_DISABLE=y
 CONFIG_NXFLAT=n
 CONFIG_SCHED_WORKQUEUE=y
 CONFIG_SCHED_WORKPRIORITY=50
-CONFIG_SCHED_WORKPERIOD=50
+CONFIG_SCHED_WORKPERIOD=(50*1000)
 CONFIG_SCHED_WORKSTACKSIZE=1024
 CONFIG_SIG_SIGWORK=4
 
diff --git a/configs/stm3210e-eval/ostest/defconfig b/configs/stm3210e-eval/ostest/defconfig
index 45e416804ad..0ea76f6cdfd 100755
--- a/configs/stm3210e-eval/ostest/defconfig
+++ b/configs/stm3210e-eval/ostest/defconfig
@@ -319,7 +319,7 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_SCHED_WORKPRIORITY - The execution priority of the worker
 #  thread.  Default: 50
 # CONFIG_SCHED_WORKPERIOD - How often the worker thread checks for
-#  work.  Default: 50 MS.
+#  work in units of microseconds.  Default: 50*1000 (50 MS).
 # CONFIG_SCHED_WORKSTACKSIZE - The stack size allocated for the worker
 #  thread.  Default: CONFIG_IDLETHREAD_STACKSIZE.
 # CONFIG_SIG_SIGWORK - The signal number that will be used to wake-up
@@ -351,7 +351,7 @@ CONFIG_SDCLONE_DISABLE=y
 CONFIG_NXFLAT=n
 CONFIG_SCHED_WORKQUEUE=n
 CONFIG_SCHED_WORKPRIORITY=50
-CONFIG_SCHED_WORKPERIOD=50
+CONFIG_SCHED_WORKPERIOD=(50*1000)
 CONFIG_SCHED_WORKSTACKSIZE=1024
 CONFIG_SIG_SIGWORK=4
 
diff --git a/configs/stm3210e-eval/usbserial/defconfig b/configs/stm3210e-eval/usbserial/defconfig
index 6d7adf0c046..23910eb2d3d 100755
--- a/configs/stm3210e-eval/usbserial/defconfig
+++ b/configs/stm3210e-eval/usbserial/defconfig
@@ -319,7 +319,7 @@ CONFIG_HAVE_LIBM=n
 # CONFIG_SCHED_WORKPRIORITY - The execution priority of the worker
 #  thread.  Default: 50
 # CONFIG_SCHED_WORKPERIOD - How often the worker thread checks for
-#  work.  Default: 50 MS.
+#  work in units of microseconds.  Default: 50*1000 (50 MS).
 # CONFIG_SCHED_WORKSTACKSIZE - The stack size allocated for the worker
 #  thread.  Default: CONFIG_IDLETHREAD_STACKSIZE.
 # CONFIG_SIG_SIGWORK - The signal number that will be used to wake-up
@@ -352,7 +352,7 @@ CONFIG_SDCLONE_DISABLE=y
 CONFIG_NXFLAT=n
 CONFIG_SCHED_WORKQUEUE=n
 CONFIG_SCHED_WORKPRIORITY=50
-CONFIG_SCHED_WORKPERIOD=50
+CONFIG_SCHED_WORKPERIOD=(50*1000)
 CONFIG_SCHED_WORKSTACKSIZE=1024
 CONFIG_SIG_SIGWORK=4