diff --git a/README.md b/README.md
index fa8a96e..e905cb3 100644
--- a/README.md
+++ b/README.md
@@ -25,13 +25,13 @@ Building on Linux
 
 ### Building for Linux
 
-You will need CMake, libpng, zlib, json-c, fontconfig, freetype, gtkmm 2.4,
-pangomm 1.4, OpenGL and OpenGL GLU. To build tests, you will need cairo.
+You will need CMake, zlib, json-c, libpng, cairo, freetype, fontconfig, gtkmm 2.4, pangomm 1.4,
+OpenGL and OpenGL GLU, and optionally, the Space Navigator client library.
 On a Debian derivative (e.g. Ubuntu) these can be installed with:
 
-    apt-get install libpng-dev libjson-c-dev libfreetype6-dev \
+    apt-get install cmake libjson-c-dev libpng-dev libcairo2-dev libfreetype6-dev \
                     libfontconfig1-dev libgtkmm-2.4-dev libpangomm-1.4-dev \
-                    libcairo2-dev libgl-dev libglu-dev cmake
+                    libgl-dev libglu-dev libspnav-dev
 
 Before building, check out the necessary submodules: