diff --git a/README.md b/README.md
index d3f6166..9bfe82f 100644
--- a/README.md
+++ b/README.md
@@ -2,10 +2,5 @@
 ---
 a 3D engine
 ---
-### 3Ddisplay in the terminal
-display something in the terminal in the form of 3D.
-### Principle
-+ graph-described file
-+ picture-displayed file
-+ a engine to process the file and output ascii pictures-displayed file
-+ a converter to tranform pictures-displayed file into something displayed in the terminal
+### [3Ddisplay in the terminal](file/terminal.md)
+
diff --git a/file/terminal.md b/file/terminal.md
new file mode 100644
index 0000000..6461be3
--- /dev/null
+++ b/file/terminal.md
@@ -0,0 +1,9 @@
+# 3D engine in the terminal
+display something in the terminal in the form of 3D.
+---
+### Principle
++ graph-described file
++ picture-displayed file
++ a engine to process the file and output ascii pictures-displayed file
++ a converter to tranform pictures-displayed file into something displayed in the terminal
+