diff --git a/readme.md b/readme.md
index bda965c..21da964 100644
--- a/readme.md
+++ b/readme.md
@@ -11,10 +11,11 @@ javascript support
 - sh
 - libgtk-2-0
 - libgconf-2-4
+- libxshmfence1
 - xvfb (if you're running it headless)
 
 ## Setup 
-- `sudo apt install libgtk2.0-0 libgconf-2-4` (if you're on debian, other
+- `sudo apt install libgtk2.0-0 libgconf-2-4 libxshmfence1` (if you're on debian, other
   distros idk)
 - `sudo apt install xvfb` (again, on debian)
 - `git clone https://tildegit.org/sose/hellgate`