--- a/ssm.en.xml	Sat Sep 21 14:11:31 2019 +0200
+++ b/ssm.en.xml	Sat Sep 21 14:24:33 2019 +0200
@@ -50,7 +50,12 @@
 		<item>
 			<id>c3599313-338b-428d-885f-964a443d76c6</id>
 			<!-- TODO: MUST + exception for older software -->
-			<text>The license should be compatible with GNU GPL in order to allow mixing with the GPL code.</text>
+			<text>The license must be compatible with GNU GPLv3 in order to allow mixing with the GPL code.</text>
+			<text>The only exception is older software (created before this manifesto i.e. 2019) which is unable to change the license</text>
+			<text>due to the copyright owned by many authors who can not be reached anymore and who can not provide approval with the license upgrade.</text>
+			<text>Such software is called „Sane with exception“.</text>
+			<!-- TODO: provide exact wording of the exception e.g. XYZ is „Sane software (with GPLv2 license exception)“ -->
+			<note>Software versioned under GPLv2+ or GPLv3+ is compatible with GPLv3.</note>
 		</item>
 		<item>
 			<id>f39b90ae-0054-467e-a9e2-43379b7c2331</id>