diff --git a/README.md b/README.md
index 1ef161c..215c810 100644
--- a/README.md
+++ b/README.md
@@ -18,15 +18,16 @@ Please fix my terrible cargo-cult PowerShell.
 Parameters
 ----------
 
-| Input       | Default                                      | Description
-| ----------- | -------------------------------------------- | -----------
-| platform    | x86_64                                       | Install the x86 or x86\_64 version of Cygwin.
-| packages    | *none*                                       | List of additional packages to install.
-| install-dir | C:\cygwin                                    | Installation directory
-| site        | http://mirrors.kernel.org/sourceware/cygwin/ | Mirror sites to install from, separated by whitespace
-| pubkeys     | *none*                                       | Absolute paths of extra public key files (RFC4880 format), separated by whitespace
-| check-sig   | true                                         | Whether to check the setup.ini signature
-| add-to-path | true                                         | Whether to add Cygwin's `/bin` directory to the system `PATH`
+| Input               | Default                                      | Description
+| ------------------- | -------------------------------------------- | -----------
+| platform            | x86_64                                       | Install the x86 or x86\_64 version of Cygwin.
+| packages            | *none*                                       | List of additional packages to install.
+| install-dir         | C:\cygwin                                    | Installation directory
+| site                | http://mirrors.kernel.org/sourceware/cygwin/ | Mirror sites to install from, separated by whitespace
+| pubkeys             | *none*                                       | Absolute paths of extra public key files (RFC4880 format), separated by whitespace
+| check-sig           | true                                         | Whether to check the setup.ini signature
+| add-to-path         | true                                         | Whether to add Cygwin's `/bin` directory to the system `PATH`
+| allow-test-packages | false                                        | Consider package versions marked test for installation
 
 Line endings
 ------------