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-rw-r--r--docs/source/plugins/data.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/source/plugins/data.rst b/docs/source/plugins/data.rst
index 5585fe8fd43..8c19db64779 100644
--- a/docs/source/plugins/data.rst
+++ b/docs/source/plugins/data.rst
@@ -16,6 +16,10 @@ To set the folders where the data plugin looks for supported files, choose
**Configure Directories**, and then choose **DATs**. You can also set the
``historypath`` option in your **ui.ini** file.
+Loading large data files like **history.xml** can take quite a while, so please
+be patient the first time you start MAME after updating or adding new data
+files.
+
The following files are supported:
history.xml