diff --git a/INSTALL.md b/INSTALL.md
index db8c4bfc..c4332ced 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -41,6 +41,7 @@ You can also use [Meson](https://mesonbuild.com/) as an alternative.
 * xcb-util-wm (sometimes split as libxcb-ewmh and libxcb-icccm)
 * xcb-util-xrm [new module might not be available in your distribution. The source can be found
   here](https://github.com/Airblader/xcb-util-xrm/)
+* libgif (optional)
 
 On debian based systems, the developer packages are in the form of: `<package>-dev` on rpm based
 `<package>-devel`.