diff --git a/specification/system/aa000.adoc b/specification/system/aa000.adoc
index 6835daa..59e3839 100644
--- a/specification/system/aa000.adoc
+++ b/specification/system/aa000.adoc
@@ -2,7 +2,7 @@
 
 == aa000
 
-Version: 0.2.0.5
+Version: 0.2.0.6
 
 System purpose: Desktop - Internal - General purpose
 
@@ -10,6 +10,10 @@ Serial numbers, MAC addresses, and similiar identifiers are not included due to
 
 Quantities of each component are denoted within parenthesis after the component details.
 
+Non-applicable value: N/A
+
+Unknown value: ?
+
 === Motherboard
 
 [%autowidth]