diff --git a/Build.md b/Build.md
index ed647fe..c8b130b 100644
--- a/Build.md
+++ b/Build.md
@@ -130,7 +130,8 @@ Also you can install ccls-git from the archlinuxcn repo using pacman.
 ### Debian
 
 ```sh
-apt install clang-7 libclang-7-dev
+# system clang: apt install clang-7 libclang-7-dev
+sudo apt install zlib1g-dev libncurses-dev
 cmake -H. -BRelease -DCMAKE_PREFIX_PATH=/usr/lib/llvm-7
 ```