diff --git a/README.en.md b/README.en.md
index 422a34f..a2bbb85 100644
--- a/README.en.md
+++ b/README.en.md
@@ -56,15 +56,15 @@ Developers can quickly verify algorithms with XTDrone, such as:
 
 <img src="./image/formation_2.gif" width="640" height="368" />  
 
-8. Fixed wing
+9. Fixed wing
 
 <img src="./image/planes.gif" width="640" height="368" />  
 
-9. VTOLs
+10. VTOLs
 
 <img src="./image/vtols.gif" width="640" height="368" />  
 
-10. Self driving
+11. Self driving
 
 <img src="./image/self_driving.gif" width="640" height="368" />  
 
diff --git a/README.md b/README.md
index c931c33..7fe4362 100644
--- a/README.md
+++ b/README.md
@@ -55,16 +55,16 @@ Xiao, K., Ma, L., Tan, S., Cong, Y., Wang, X.: Implementation of UAV Coordinatio
 
 <img src="./image/formation_2.gif" width="640" height="368" />  
 
-8. 固定翼
+9. 固定翼
 
 <img src="./image/planes.gif" width="640" height="368" />  
 
-9. VTOL
+10. VTOL
 
 <img src="./image/vtols.gif" width="640" height="368" />  
 
 
-10. 自动驾驶
+11. 自动驾驶
 
 <img src="./image/self_driving.gif" width="640" height="368" />