diff --git a/docs/spec.md b/docs/spec.md
index e9eac22..20b113f 100644
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+++ b/docs/spec.md
@@ -727,14 +727,18 @@ flowchart TD
 
 ### Integration Test Scenarios
 
-| Scenario | Platforms | Expected Result |
-|----------|-----------|-----------------|
-| Julia ↔ JavaScript | Text, dictionary | Round-trip successful |
-| Python ↔ Julia | Arrow table | Arrow IPC round-trip |
-| JavaScript ↔ Python | Mixed content | All payloads preserved |
-| Large file transfer | All platforms | File server upload/download |
-| Cross-platform JSON table | All platforms | Dictionary array round-trip |
-| MicroPython ↔ Desktop | Text, dictionary only | Limited payload types |
+| Scenario | Platforms | Payload Type | Size | Transport | Expected Result |
+|----------|-----------|--------------|------|-----------|-----------------|
+| Single text payload | All | text | Small | direct | Round-trip successful |
+| Single dictionary payload | All | dictionary | Small | direct | Round-trip successful |
+| Single arrow table | Julia/JS/Python | arrowtable | Small | direct | Arrow IPC round-trip |
+| Single JSON table | All | jsontable | Small | direct | Dictionary array round-trip |
+| Mixed payloads (text + image) | All | text + image | Small | direct | All payloads preserved |
+| Mixed payloads (dict + binary) | All | dictionary + binary | Small | direct | All payloads preserved |
+| Large file (link transport) | All | arrowtable/image | Large | link | File server upload/download |
+| Cross-platform JSON table | All | jsontable | Small | direct | Dictionary array round-trip |
+| MicroPython ↔ Desktop | MicroPython ↔ Desktop | text/dictionary | Small | direct | Limited payload types |
+| Desktop ↔ Desktop (all combos) | Julia↔JS↔Python | All types | Small/Large | direct/link | Full compatibility |
 
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