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-rw-r--r--include/X11/extensions/XI2proto.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/include/X11/extensions/XI2proto.h b/include/X11/extensions/XI2proto.h
index 4cdaa0d..28a9062 100644
--- a/include/X11/extensions/XI2proto.h
+++ b/include/X11/extensions/XI2proto.h
@@ -149,8 +149,9 @@ typedef struct {
/**
* Denotes button capability on a device.
- * Struct is followed by num_buttons * Atom that names the buttons in the
- * device-native setup (i.e. ignoring button mappings).
+ * Struct is followed by a button bit-mask (padded to four byte chunks) and
+ * then num_buttons * Atom that names the buttons in the device-native setup
+ * (i.e. ignoring button mappings).
*/
typedef struct {
uint16_t type; /**< Always ButtonClass */