diff --git a/examples/fdfd.py b/examples/fdfd.py
index 3fe895f..367fb70 100644
--- a/examples/fdfd.py
+++ b/examples/fdfd.py
@@ -193,7 +193,7 @@ def test1(solver=generic_solver):
     pyplot.subplot(2, 2, 2)
     pyplot.plot(numpy.log10(numpy.abs(E[1][:, center[1], center[2]]) + 1e-10))
     pyplot.grid(alpha=0.6)
-    pyplot.ylabel('log10 of field')
+    pyplot.ylabel('log10 of Ey @ centerline')
     pyplot.subplot(2, 2, 3)
     pcolor(numpy.real(E[1][:, :, center[2]]).T)
     pyplot.subplot(2, 2, 4)