diff --git a/docs/number_allocations.md b/docs/number_allocations.md
index ea36f830..7f7e9372 100644
--- a/docs/number_allocations.md
+++ b/docs/number_allocations.md
@@ -8,9 +8,11 @@ The `PAYLOAD_TYPE_GRP_DATA` payloads have a 16-bit data-type field, which identi
 
 To make sure multiple applications can function without interfering with each other, the table below is for reserving various ranges of data-type values. Just modify this table, adding a row, then submit a PR to have it authorised/merged.
 
-The 16-bit types are allocated in blocks of 16, ie. the lower 4-bits is the range.
+NOTE: the range FF00 - FFFF is for use while you're developing, doing POC, and for these you don't need to request to use/allocate.
 
-| Data-Type range | App name                 | Contact                                              |
-|-----------------|--------------------------|------------------------------------------------------|
-| 000x            | -reserved-               |  |
-| FFFx            | -reserved-               |  |
+(add rows, using the range 0100 - FEFF for custom apps)
+
+| Data-Type range | App name                    | Contact                                              |
+|-----------------|-----------------------------|------------------------------------------------------|
+| 0000 - 00FF     | -reserved for internal use- |  |
+| FF00 - FFFF     | -reserved for testing/dev-  |  |