diff --git a/Release_Notes_4.0-alpha2.md b/Release_Notes_4.0-alpha2.md
index a4d8af6..8cb27b8 100644
--- a/Release_Notes_4.0-alpha2.md
+++ b/Release_Notes_4.0-alpha2.md
@@ -27,7 +27,19 @@ Apprmor 4.0 is a bridge release between older AppArmor 3.x policy and the newer
 
 ##  Feature Matrix
 
-???
+|:Feature:       | affects policy |breaks 3.x      |supported by utils|requires 4.x libapparmor|requires kernel support|
+|---             |---             |---             |---               |---                     |--- |
+|unconfined flag | Y              | Y <sup>1</sup> | N                | N                      | Y <sup>2</sup> |
+|debug flag      | Y              | Y <sup>1</sup> | N                | N                      | Y <sup>2</sup> |
+| posix mqueue   | Y              | Y <sup>1</sup> | N                | N                      | Y <sup>2</sup> |
+| user ns        | Y              | Y <sup>1</sup> | N                | N                      | Y <sup>2</sup> |
+| io_uring       | Y              | Y <sup>1</sup> | N                | N                      | Y <sup>2</sup> |
+| aa-status filters | N | N | n/a | N | N |
+| aa-load | N | N | n/a | Y | N |
+
+1. If present in policy will cause previous versions of AppArmor to fail
+2. Requires kernel support, policy can be downgraded to work on kernels that do not support.
+3. 
 
 ## Compatibility