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diff --git a/docs/aoa/irq.rst b/docs/aoa/irq.rst
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@@ -8,6 +8,8 @@ IRQ
Glances displays the top 5 interrupts rate. This plugin is only available on
GNU/Linux machine (stats are grabbed from the /proc/interrupts file).
+Note: /proc/interrupts file did not exist inside OpenVZ containers.
+
How to read the informations:
* The first Column is the IRQ number / name