diff --git a/blueplum.nix b/blueplum.nix
index 0ade1cd..1a3e190 100644
--- a/blueplum.nix
+++ b/blueplum.nix
@@ -101,4 +101,11 @@ in
                 ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="056a", TAG+="systemd", ENV{SYSTEMD_USER_WANTS}+="wacom.service"
             '';
         };
+
+    homeManager = {
+        programs.git.signing = {
+            signByDefault = true;
+            key = "60649DFDEAACD73D";
+        };
+    };
 }