diff --git a/Readme.md b/Readme.md
index 2f938d0..f0e10a5 100644
--- a/Readme.md
+++ b/Readme.md
@@ -35,6 +35,9 @@ ml
 #### Documentation
 see /doc/Doc.md
 
+#### Dependencies
+- libssl-dev
+
 #### Compile
 ```
 mkdir -p build
@@ -72,7 +75,6 @@ utils/local_install.sh
 - add some mem stats to benchmark
 
 #### Code
-- MlEnvironment::get should be map instead of many if's
 - tcpnet should use RAII
 - add documentation
 - add more unit test, mainly for usql