diff --git a/include/processor-box.html b/include/processor-box.html
index 40fc3961..9e9fe09d 100644
--- a/include/processor-box.html
+++ b/include/processor-box.html
@@ -71,8 +71,9 @@
 </figure>
 
 <p>
-  To the left of the name of each processor is a small LED symbol; if this is lit-up, the processor is active. Clicking on it
-  will deactivate the processor and effectively bypass it.
+  To the left of the name of each processor is a small LED symbol; if this is lit-up, the processor is active. 
+  <kbd class=mouse>Left</kbd>-clicking on the LED symbol, or <kbd class=mouse>Middle</kbd>-clicking anywhere on the processor
+  will deactivate the processor and effectively bypass it. Click again to reactivate the processor.
 </p>
 
 <p class="note">