diff --git a/README b/README
index 8eb18196..a501ae6b 100644
--- a/README
+++ b/README
@@ -111,6 +111,10 @@ b. Building from Source
                        libglib2.0-dev uuid-dev libparted-dev \
                        libgtkmm-3.0-dev
 
+   Debian 13 and later and Ubuntu 24.04 LTS and later also require this
+   dependency installing:
+      sudo apt install libpolkit-gobject-1-dev
+
    On Fedora, these dependencies may be obtained by running the
    following command as root:
       dnf install gnome-common yelp-tools glib2-devel gcc-c++ \