diff --git a/README.md b/README.md
index cc5d940..77ca840 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,7 @@ The JUnit style XML report for this project looks like this:
 - `include_file_line?` (boolean - default `false`): only has effect when `include_filename?` is `true`. Dictates whether `file` attribute should include line of the test after a colon (e.g. `test/file_test.exs:123`).
 - `automatic_create_dir?` (boolean - default `false`): create a directory that defined in `report_dir` before writing report files.
 - `project_dir` (string - default `nil`). Specifies which directory the test file paths should be relative to within the XML. If unset or `nil`, the path to the test file is calculated relative to the current working directory.
+- `properties` (map - default `%{}`): custom properties to include in the JUnit XML `<properties>` section. These properties will be merged with the default properties (seed and date).
 
 Example configuration:
 
@@ -87,7 +88,13 @@ config :junit_formatter,
   report_dir: "/tmp",
   print_report_file: true,
   prepend_project_name?: true,
-  include_filename?: true
+  include_filename?: true,
+  properties: %{
+    "platform.os" => "linux",
+    "platform.architecture" => "x86_64",
+    "test.tier" => "1",
+    "environment" => "ci"
+  }
 ```
 
 This would generate the report at: `/tmp/myapp-report_file_test.xml`.
diff --git a/lib/formatter.ex b/lib/formatter.ex
index 7483d8d..037e395 100644
--- a/lib/formatter.ex
+++ b/lib/formatter.ex
@@ -59,12 +59,18 @@ defmodule JUnitFormatter do
       :ok = File.mkdir_p(report_dir())
     end
 
+    # Merge default properties with custom properties from configuration
+    default_properties = %{
+      seed: opts[:seed],
+      date: DateTime.to_iso8601(DateTime.utc_now())
+    }
+    
+    custom_properties = Application.get_env(:junit_formatter, :properties, %{})
+    all_properties = Map.merge(default_properties, custom_properties)
+
     {:ok,
      %__MODULE__{
-       properties: %{
-         seed: opts[:seed],
-         date: DateTime.to_iso8601(DateTime.utc_now())
-       }
+       properties: all_properties
      }}
   end