1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-format b/Documentation/ABI/testing/sysfs-bus-event_source-devices-format
index 079afc71363d..77f47ff5ee02 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-format
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-format
@@ -9,6 +9,12 @@ Description:
                 we want to export, so that userspace can deal with sane
                 name/value pairs.
 
+                Userspace must be prepared for the possibility that attributes
+                define overlapping bit ranges. For example:
+                        attr1 = 'config:0-23'
+                        attr2 = 'config:0-7'
+                        attr3 = 'config:12-35'
+
                 Example: 'config1:1,6-10,44'
                 Defines contents of attribute that occupies bits 1,6-10,44 of
                 perf_event_attr::config1.