Index: /trunk/GSASIIconstrGUI.py
===================================================================
 /trunk/GSASIIconstrGUI.py (revision 4605)
+++ /trunk/GSASIIconstrGUI.py (revision 4606)
@@ 3018,10 +3018,9 @@
Indx[refSel.GetId()] = i
refAtmSizer.Add(refSel,0,WACV)
 refHelpInfo = '''
The Orientation reference control is used to tranform
the Cartesian
axes for rigid bodies with three atoms, A, B and C.
The vector from A to B defines the xaxis and the y axis is placed
in the plane defined by A to B and A to C.
+ refHelpInfo = '''
+* The "Orientation Reference" control defines the Cartesian
+axes for rigid bodies with the three atoms, A, B and C.
+The vector from B to A defines the xaxis and the y axis is placed
+in the plane defined by B to A and C to A. A,B,C must not be collinear.
'''
hlp = G2G.HelpButton(VectorRBDisplay,refHelpInfo,wrap=400)
@@ 3386,12 +3385,13 @@
refAtmSizer.Add(molcent,0,WACV)
refHelpInfo = '''
* The "Orientation Reference" control is used to tranform
the Cartesian
axes for rigid bodies with three atoms, A, B and C.
The vector from A to B defines the xaxis and the y axis is placed
in the plane defined by A to B and A to C.

%%* The "Center RB?" button will redefine the origin of the
rigid body to the midpoint of all atoms in the body (not mass weighted)
+* The "Orientation Reference" control defines the Cartesian
+axes for rigid bodies with the three atoms, A, B and C.
+The vector from B to A defines the xaxis and the y axis is placed
+in the plane defined by B to A and C to A. A,B,C must not be collinear.
+
+%%* The origin is at A unless the "Center RB?" button is pressed.
+
+%%* The "Center RB?" button will shift the origin of the
+rigid body to be the midpoint of all atoms in the body (not mass weighted).
'''
hlp = G2G.HelpButton(ResidueRBDisplay,refHelpInfo,wrap=400)