diff --git a/docs/src/misc.rst b/docs/src/misc.rst
index d9bf3aef..8515cdbc 100644
--- a/docs/src/misc.rst
+++ b/docs/src/misc.rst
@@ -649,6 +649,16 @@ API
         On Windows, setting `PRIORITY_HIGHEST` will only work for elevated user,
         for others it will be silently reduced to `PRIORITY_HIGH`.
 
+    .. note::
+        On IBM i PASE, the highest process priority is -10. The constant
+        `UV_PRIORITY_HIGHEST` is -10, `UV_PRIORITY_HIGH` is -7, 
+        `UV_PRIORITY_ABOVE_NORMAL` is -4, `UV_PRIORITY_NORMAL` is 0,
+        `UV_PRIORITY_BELOW_NORMAL` is 15 and `UV_PRIORITY_LOW` is 39.
+
+    .. note::
+        On IBM i PASE, you are not allowed to change your priority unless you
+        have the *JOBCTL special authority (even to lower it).
+
     .. versionadded:: 1.23.0
 
 .. c:function:: int uv_os_uname(uv_utsname_t* buffer)
diff --git a/include/uv.h b/include/uv.h
index 0745fe0d..9fb52e47 100644
--- a/include/uv.h
+++ b/include/uv.h
@@ -1182,12 +1182,22 @@ UV_EXTERN void uv_os_free_passwd(uv_passwd_t* pwd);
 UV_EXTERN uv_pid_t uv_os_getpid(void);
 UV_EXTERN uv_pid_t uv_os_getppid(void);
 
-#define UV_PRIORITY_LOW 19
-#define UV_PRIORITY_BELOW_NORMAL 10
-#define UV_PRIORITY_NORMAL 0
-#define UV_PRIORITY_ABOVE_NORMAL -7
-#define UV_PRIORITY_HIGH -14
-#define UV_PRIORITY_HIGHEST -20
+#if defined(__PASE__)
+/* On IBM i PASE, the highest process priority is -10 */
+# define UV_PRIORITY_LOW 39            // RUNPTY(99)
+# define UV_PRIORITY_BELOW_NORMAL 15   // RUNPTY(50)
+# define UV_PRIORITY_NORMAL 0          // RUNPTY(20)
+# define UV_PRIORITY_ABOVE_NORMAL -4   // RUNTY(12)
+# define UV_PRIORITY_HIGH -7           // RUNPTY(6)
+# define UV_PRIORITY_HIGHEST -10       // RUNPTY(1)
+#else
+# define UV_PRIORITY_LOW 19
+# define UV_PRIORITY_BELOW_NORMAL 10
+# define UV_PRIORITY_NORMAL 0
+# define UV_PRIORITY_ABOVE_NORMAL -7
+# define UV_PRIORITY_HIGH -14
+# define UV_PRIORITY_HIGHEST -20
+#endif
 
 UV_EXTERN int uv_os_getpriority(uv_pid_t pid, int* priority);
 UV_EXTERN int uv_os_setpriority(uv_pid_t pid, int priority);