diff --git a/hosts/darwin/home-default.nix b/hosts/darwin/home-default.nix
index 2836c12..a4c1a8a 100644
--- a/hosts/darwin/home-default.nix
+++ b/hosts/darwin/home-default.nix
@@ -276,6 +276,9 @@
     # Documents - PDF with PDF Expert
     run ${pkgs.duti}/bin/duti -s com.readdle.PDFExpert-Mac .pdf all
 
+    # Diagrams - Draw.io
+    run ${pkgs.duti}/bin/duti -s com.jgraph.drawio.desktop .drawio all
+
     # Images - Preview
     run ${pkgs.duti}/bin/duti -s com.apple.Preview .png all
     run ${pkgs.duti}/bin/duti -s com.apple.Preview .jpg all
diff --git a/modules/homebrew.nix b/modules/homebrew.nix
index cdcfa9b..043390b 100644
--- a/modules/homebrew.nix
+++ b/modules/homebrew.nix
@@ -44,6 +44,7 @@
       "raspberry-pi-imager"
       "transmission"
       "pdf-expert"
+      "drawio"
     ];
     taps = [
       # Additional repositories if needed