diff --git a/src/list/assets/list-of-list.svg b/src/list/assets/list-of-list.svg
deleted file mode 100644
index 0b942215..00000000
--- a/src/list/assets/list-of-list.svg
+++ /dev/null
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diff --git a/src/list/assets/list-of-lists.drawio b/src/list/assets/list-of-lists.drawio
new file mode 100644
index 00000000..9a6cbff5
--- /dev/null
+++ b/src/list/assets/list-of-lists.drawio
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diff --git a/src/list/assets/list-of-lists.svg b/src/list/assets/list-of-lists.svg
new file mode 100644
index 00000000..ba33ad3d
--- /dev/null
+++ b/src/list/assets/list-of-lists.svg
@@ -0,0 +1,3 @@
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\ No newline at end of file
diff --git a/src/list/assets/list-of-list.drawio b/src/list/assets/multi-level-linked-list.drawio
similarity index 82%
rename from src/list/assets/list-of-list.drawio
rename to src/list/assets/multi-level-linked-list.drawio
index 07fff5b3..7fc2375e 100644
--- a/src/list/assets/list-of-list.drawio
+++ b/src/list/assets/multi-level-linked-list.drawio
@@ -1,4 +1,4 @@
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diff --git a/src/list/assets/multi-level-linked-list.svg b/src/list/assets/multi-level-linked-list.svg
new file mode 100644
index 00000000..802fa1a5
--- /dev/null
+++ b/src/list/assets/multi-level-linked-list.svg
@@ -0,0 +1,3 @@
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diff --git a/src/list/assets/unrolled-linked-list.drawio b/src/list/assets/unrolled-linked-list.drawio
index c9c46465..c4ab77d7 100644
--- a/src/list/assets/unrolled-linked-list.drawio
+++ b/src/list/assets/unrolled-linked-list.drawio
@@ -1,4 +1,4 @@
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diff --git a/src/list/assets/unrolled-linked-list.svg b/src/list/assets/unrolled-linked-list.svg
index 2b869fbb..149945dc 100644
--- a/src/list/assets/unrolled-linked-list.svg
+++ b/src/list/assets/unrolled-linked-list.svg
@@ -1,3 +1,3 @@
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diff --git a/src/list/types.md b/src/list/types.md
index b48abfcf..9e0e4c84 100644
--- a/src/list/types.md
+++ b/src/list/types.md
@@ -153,13 +153,19 @@ struct person {
{{#include assets/sparse-matrix.c:5:}}
```
+这样的稀疏矩阵可以同时基于行号和列号进行线性查找, 比较方便.
其结构图如下所示:
-或者表示多层链表 Multi-level linked list, 或者称为 List of list, 如下图所示:
+或者表示多层链表 Multi-level linked list, 如下图所示:
-
+
+
+还有一种简化了的, 称为 List of lists (LIL), 这种的, 索引方式要简单些.
+如下图所示:
+
+
## Unrolled Linked List