diff --git a/LICENSE.md b/LICENSE.md
index c8bce06..c3528e7 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -2,7 +2,9 @@
 
 ## Trademark
 
-PostalPoint is a registered trademark of PostalPortal LLC and cannot be used without express written permission.  Before producing boards or distributing software, you must delete the trademark from the silkscreen and source code (especially print statements).
+PostalPoint is a registered trademark of PostalPortal LLC and cannot be used without express written permission.
+Before producing boards or distributing software, you must remove references to PostalPoint.
+Exception: If the communication protocol of the device remains compatible with the original code, you may instead replace "PostalPoint" with "PostalPoint-compatible".
 
 ## Software