diff --git a/doc/en/prefix_cache.md b/doc/en/prefix_cache.md
index bdbac02..f854b44 100644
--- a/doc/en/prefix_cache.md
+++ b/doc/en/prefix_cache.md
@@ -1,6 +1,6 @@
 ## Enabling Prefix Cache Mode in KTransformers
 
-To enable **Prefix Cache Mode** in KTransformers, you need to modify the configuration file and recompile the project.
+Balance serve now supports prefix cache reuse! To enable **Prefix Cache Mode** in KTransformers, you need to modify the configuration file and recompile the project. 
 
 ### Step 1: Modify the Configuration File
 
@@ -31,4 +31,8 @@ Then recompile the project:
 USE_BALANCE_SERVE=1  bash ./install.sh
 # For those who have two cpu and 1T RAM（Dual NUMA）:
 USE_BALANCE_SERVE=1 USE_NUMA=1 bash ./install.sh
-```
\ No newline at end of file
+```
+
+## Note
+Balance serve utilizes a 3-layer (GPU-CPU-Disk) scheme to store and reuse KVCache. Deleting KVCache is not supported now. If you have too much KVCache, you can simply delete them by remove kvcache files. 
+