Note which kernel versions are affected by REJECT change (Maciej Soltysiak)
diff --git a/INCOMPATIBILITIES b/INCOMPATIBILITIES
index 7057b26..ddb2408 100644
--- a/INCOMPATIBILITIES
+++ b/INCOMPATIBILITIES
@@ -4,6 +4,8 @@
   with kernels that do not support it, will result in a plain DROP instead
   of REJECT.  Use with caution.
   Kernels that do support it:
+  	2.4 - since 2.4.22-pre9
+	2.6 - all
 
 - There are some issues related to upgrading from 1.2.x to 1.3.x on a system
   with dynamic ruleset changes during runtime. (Please see