diff --git a/abi-versions/v0.2.1/README.md b/abi-versions/v0.2.1/README.md
index e2cac03..b01e06b 100644
--- a/abi-versions/v0.2.1/README.md
+++ b/abi-versions/v0.2.1/README.md
@@ -2080,6 +2080,19 @@ changes to unrelated connections/requests.
 - `REALTIME` = `0`
 - `MONOTONIC` = `1`
 
+# Callback transition diagram
+
+Below is a diagram for the HTTP module callback order: 
+
+```mermaid
+flowchart TD;
+    {start} --> on_context_create0;
+    on_context_create0 --> on_vm_start;
+    on_vm_start --> on_configure;
+    on_configure --> |per-request N| on_context_createN;
+    on_context_createN --> on_request_headers;
+```
+
 
 [integration]: #Integration
 [memory management]: #Memory-management