diff --git a/cpuset/commands/proc.py b/cpuset/commands/proc.py
index 855626d..af688b6 100644
--- a/cpuset/commands/proc.py
+++ b/cpuset/commands/proc.py
@@ -684,7 +684,7 @@ def move_pidspec(pidspec, toset, fset=None, threads=False):
 
 def task_detail(pid, width=70):
     # scheduler policy definitions
-    policy = ['o', 'f', 'r', 'b']
+    policy = ['o', 'f', 'r', 'b', '?', 'i']
     # stat location definitions
     statdef = {
         'pid': 0,
@@ -732,6 +732,11 @@ def task_detail(pid, width=70):
         out2.append('th')
     elif stat[statdef['rtpolicy']] == '3':
         out2.append('at')
+    # SCHED_ISO is reserved but not yet implemented as of Linux v4.4
+    elif stat[statdef['rtpolicy']] == '4':
+        out2.append('??')
+    elif stat[statdef['rtpolicy']] == '5':
+        out2.append('dl')
     else:
         if int(stat[statdef['rtpriority']]) < 10:
             out2.append('_')