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-rw-r--r--docs/source/advanced/ctrlr_config.rst6
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/source/advanced/ctrlr_config.rst b/docs/source/advanced/ctrlr_config.rst
index 9e284f7f945..7c4f5073638 100644
--- a/docs/source/advanced/ctrlr_config.rst
+++ b/docs/source/advanced/ctrlr_config.rst
@@ -257,5 +257,7 @@ Here’s an example numbering two light guns and two XInput game controllers:
</input>
</system>
-MAME applies ``mapdevice`` elements found inside any applicable ``system``
-element.
+MAME applies ``mapdevice`` elements found inside the first applicable ``system``
+element only. To avoid confusion, it’s simplest place the ``system`` element
+element applying to all systems (``name`` attribute set to ``default``) first
+in the file, and use it to assign input device numbers.