diff --git a/tools/power/pm-graph/sleepgraph.py b/tools/power/pm-graph/sleepgraph.py
index f6d172254829..c8bc3bed3f5a 100755
--- a/tools/power/pm-graph/sleepgraph.py
+++ b/tools/power/pm-graph/sleepgraph.py
@@ -1448,7 +1448,7 @@ class DevProps:
 
 # Class: DeviceNode
 # Description:
-#	 A container used to create a device hierachy, with a single root node
+#	 A container used to create a device hierarchy, with a single root node
 #	 and a tree of child nodes. Used by Data.deviceTopology()
 class DeviceNode:
 	def __init__(self, nodename, nodedepth):