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diff --git a/flake.nix b/flake.nix
index 567f4b5525f6ee063c60da1f8e075763fd8399d8..9846d7f9b4ea065bb775731b6c54856a9c3505b2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -30,6 +30,13 @@           ];
 
           doCheck = false;
 
+          nativeBuildInputs = [pkgs.installShellFiles];
+
+          preInstall = ''
+            go run man.go
+            installManPage git-age.1
+          '';
+
           meta = with pkgs.lib; {
             description = "";
             homepage = "https://git.jojodev.com/jolheiser/git-age";

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diff --git a/man.go b/man.go
new file mode 100644
index 0000000000000000000000000000000000000000..15ff69a7cf57bd32846c52d6e4836e8a4520cb80
--- /dev/null
+++ b/man.go
@@ -0,0 +1,25 @@
+//go:build man
+
+package main
+
+import (
+	"os"
+
+	"go.jolheiser.com/git-age/cmd"
+)
+
+func main() {
+	fi, err := os.Create("git-age.1")
+	if err != nil {
+		panic(err)
+	}
+	defer fi.Close()
+
+	app := cmd.New()
+	man, err := app.ToMan()
+	if err != nil {
+		panic(err)
+	}
+
+	fi.WriteString(man)
+}