diff --git a/Documentation/reference/user/02_task_scheduling.rst b/Documentation/reference/user/02_task_scheduling.rst
index c24b2dcce4..ece54ac852 100644
--- a/Documentation/reference/user/02_task_scheduling.rst
+++ b/Documentation/reference/user/02_task_scheduling.rst
@@ -54,7 +54,8 @@ Functions
   **POSIX Compatibility:** Comparable to the POSIX interface of the same
   name. Differences from the full POSIX implementation include:
 
-    -  The range of priority values for the POSIX call is 0 to 255.
+    -  The range of priority values for the POSIX call is 0 to 255. The
+      priority 0 is the lowest priority and 255 is the highest priority.
 
   .. note:: Setting a task's priority to the same value has the similar effect
     to ``sched_yield()``: The task will be moved to after all other tasks