diff --git a/python/hrpsys_config.py b/python/hrpsys_config.py
index fbdd69bdc9e..5c4263708da 100755
--- a/python/hrpsys_config.py
+++ b/python/hrpsys_config.py
@@ -1341,8 +1341,8 @@ def setTargetPoseRelative(self, gname, eename, dx=0, dy=0, dz=0,
         \verbatim
             robot.setTargetPoseRelative('rarm', 'RARM_JOINT5', dx=0.0001, tm=0.1)
         \endverbatim
-        @param gname str: Name of the joint group.
-        @param eename str: Name of the link.
+        @param gname str: Name of the joint group that is to be manipulated.
+        @param eename str: Name of the joint that the manipulated joint group references to.
         @param dx float: In meter.
         @param dy float: In meter.
         @param dz float: In meter.