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diff --git a/module11/README.md b/module11/README.md
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+++ b/module11/README.md
@@ -1,6 +1,7 @@
 # 11. Disk Manager (4th Week)
 
 ## 1) Major Functions
+### 1. Structures
 ```c
 disk_reserve_from_cache
 │
@@ -31,6 +32,31 @@ disk_reserve_from_cache
 
 <br/>
 
+### 2. Diagram
+(1) `disk_reserve_from_cache` calls
+
+<div style="display:flex" align="center">
+    <img src="images/1.png" alt="1" width="800"/>
+</div>
+
+<br/>
+
+(2) `disk_reserve_from_cache_vols` calls
+
+<div style="display:flex" align="center">
+    <img src="images/2.png" alt="2" width="800"/>
+</div>
+
+<br/>
+
+(3) `disk_reserve_from_cache_volume` calls
+
+<div style="display:flex" align="center">
+    <img src="images/3.png" alt="3" width="800"/>
+</div>
+
+<br/>
+
 ## 2) disk_cache_lock_reserve_for_purpose & disk_cache_lock_reserve
 ### 1. Purpose
 캐쉬로부터 섹터 예약을 진행하는 과정에서 볼륨의 목적에 맞는 LOCK을 취득하기 위한 함수
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