diff --git a/book/src/SUMMARY.md b/book/src/SUMMARY.md
index db78ac63..7a3e3ae9 100644
--- a/book/src/SUMMARY.md
+++ b/book/src/SUMMARY.md
@@ -18,6 +18,10 @@
 - [For DApp Developers](./developers/README.md)
     - [Flashblocks Data over JSON RPC](./developers/flashblocks-rpc.md)
 
+- [For Contributors](./contributors/README.md)
+    - [Repository Structure](./contributors/repository.md)
+    - [Ecosystem](./contributors/ecosystem.md)
+
 - [CLI Reference](./cli/README.md)
     - [rollup-boost](./cli/rollup-boost.md)
     - [websocket-proxy](./cli/websocket-proxy.md)
diff --git a/book/src/architecture/sidecar.md b/book/src/architecture/sidecar.md
index 08715a9d..9203a222 100644
--- a/book/src/architecture/sidecar.md
+++ b/book/src/architecture/sidecar.md
@@ -29,26 +29,26 @@ sequenceDiagram
     end
     box Builder
         participant builder-op-node as op-node
-        participant builder-op-geth as builder
+        participant builder-EL as builder
     end
 
-    Note over op-node, builder-op-geth: 1. Triggering Block Building
+    Note over op-node, builder-EL: 1. Triggering Block Building
     op-node->>rollup-boost: engine_FCU (with attrs)
     rollup-boost->>op-geth: engine_FCU (with attrs)
-    rollup-boost->>builder-op-geth: engine_FCU (with attrs)
+    rollup-boost->>builder-EL: engine_FCU (with attrs)
     rollup-boost->>op-node: proposer payload id
 
-    Note over op-node, builder-op-geth: 2. Get Local and Builder Blocks
+    Note over op-node, builder-EL: 2. Get Local and Builder Blocks
     op-node->>rollup-boost: engine_getPayload
     rollup-boost->>op-geth: engine_getPayload
-    rollup-boost->>builder-op-geth: engine_getPayload
+    rollup-boost->>builder-EL: engine_getPayload
 
-    Note over op-node, builder-op-geth: 3. Validating and Returning Builder Block
+    Note over op-node, builder-EL: 3. Validating and Returning Builder Block
     rollup-boost->>op-geth: engine_newPayload
     op-geth->>rollup-boost: block validity
     rollup-boost->>op-node: block payload
 
-    Note over op-node, builder-op-geth: 4. Updating Chain State
+    Note over op-node, builder-EL: 4. Updating Chain State
     op-node->>rollup-boost: engine_newPayload
     rollup-boost->>op-geth: engine_newPayload
     op-node->>rollup-boost: engine_FCU (without attrs)
diff --git a/book/src/contributors/README.md b/book/src/contributors/README.md
new file mode 100644
index 00000000..e125900c
--- /dev/null
+++ b/book/src/contributors/README.md
@@ -0,0 +1 @@
+# For Contributors
diff --git a/book/src/contributors/ecosystem.md b/book/src/contributors/ecosystem.md
new file mode 100644
index 00000000..e46e912e
--- /dev/null
+++ b/book/src/contributors/ecosystem.md
@@ -0,0 +1 @@
+# Ecosystem
diff --git a/book/src/contributors/repository.md b/book/src/contributors/repository.md
new file mode 100644
index 00000000..caab6275
--- /dev/null
+++ b/book/src/contributors/repository.md
@@ -0,0 +1 @@
+# Repository Structure