diff --git a/doc/develop/pytest/usage.rst b/doc/develop/pytest/usage.rst
index 7c42a31528f..df3821da20d 100644
--- a/doc/develop/pytest/usage.rst
+++ b/doc/develop/pytest/usage.rst
@@ -316,11 +316,13 @@ Environment variables
 The following environment variables are set when running hook scripts:
 
 - ``U_BOOT_BOARD_TYPE`` the board type being tested.
+- ``U_BOOT_BOARD_TYPE_EXTRA`` the 2nd board type being tested, if applicable.
 - ``U_BOOT_BOARD_IDENTITY`` the board identity being tested, or ``na`` if none
   was specified.
 - ``U_BOOT_SOURCE_DIR`` the U-Boot source directory.
 - ``U_BOOT_TEST_PY_DIR`` the full path to ``test/py/`` in the source directory.
 - ``U_BOOT_BUILD_DIR`` the U-Boot build directory.
+- ``U_BOOT_BUILD_DIR_EXTRA`` the 2nd U-Boot build directory, if applicable.
 - ``U_BOOT_RESULT_DIR`` the test result directory.
 - ``U_BOOT_PERSISTENT_DATA_DIR`` the test persistent data directory.