diff --git a/README.md b/README.md
index 1f9e378ef0932d71ce319f0ccb104aabdb02c6e3..07790d2cb873a59d6b18f7e679da9e2af6aacf43 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ I did some more prototyping on this design, using milled 1/16" cotton-phenolic,
 
 The DC resistance of these speakers came out to 7.5 ohms -- not too far off the 8 ohms I was shooting for.  I also analyzed the impedance as a function of frequency (using the handy Analog Discover 2 USB oscilloscope), shown below.  We can see the fundamental resonance a bit above 100 Hz (note: next prototype should make this lower).
 
-<img src="img/waveforms-impedance-1.png" height=400px>
+<img src="img/waveforms-impedance-1.png" height=600px>
 
 I took some high speed video to look at the deformation modes.  The fundamental mode is, well, fundamental: