diff --git a/labsw/README b/labsw/README
index a5f5330..ddea535 100644
--- a/labsw/README
+++ b/labsw/README
@@ -32,5 +32,5 @@ In particular, this means:
 
 - the PCB must be coated
 - opto couplers may not share the same socket
-- the front opto coupler outputs need wider spacing
+- the opto coupler headers (inputs and outputs) need wider spacing
 - clearances need to be verified