diff --git a/docsrc/frames.html b/docsrc/frames.html
index f8ddfe72..4e1a6173 100644
--- a/docsrc/frames.html
+++ b/docsrc/frames.html
@@ -67,7 +67,7 @@ <h1>Coordinate frames in EasySpin</h1>
 </p>
 
 <ul>
-<li>zL is along the static magnetic field B<sub>0</sub>, in agreement with the universal convention in magnetic resonance. For a spectrometer with an electromagnet (X and Q band), zL is horizontal and points to the left. For a spectrometer with a standard superconducting magnet (W band and higher), zL is vertical and points up.</li>
+<li>zL is along the static magnetic field B<sub>0</sub>, in agreement with the universal convention in magnetic resonance. For an electromagnet with horizontal B<sub>0</sub>, zL is horizontal and points to the left. For a standard superconducting magnet with vertical B<sub>0</sub>, zL is vertical and points up. For a split-coil superconducing magnet with horizontal B<sub>0</sub>, zL is horizontal and points to the left.</li>
 <li>yL points away from the user.</li>
 <li>xL is defined such that the (xL, yL, zL) coordinate frame is right-handed. For an electromagnet, xL is vertical and points up. For a standard superconducting magnet, xL is horizontal and points to the right.</li>
 </ul>
diff --git a/docsrc/img/labframe.png b/docsrc/img/labframe.png
index 9cb32fb5..f191f396 100644
Binary files a/docsrc/img/labframe.png and b/docsrc/img/labframe.png differ