1 files changed, 1 insertions, 0 deletions
diff --git a/ps2comm.h b/ps2comm.h
index b78adb9..d7d475a 100644
--- a/ps2comm.h
+++ b/ps2comm.h
@@ -14,6 +14,7 @@
 /* synaptics model ID bits */
 #define SYN_MODEL_ROT180(synhw) 	((synhw).model_id & (1 << 23))
 #define SYN_MODEL_PORTRAIT(synhw)	((synhw).model_id & (1 << 22))
+#define SYN_CAP_MIDDLE_BUTTON(synhw)	((synhw).model_id & (1 << 18))
 #define SYN_MODEL_SENSOR(synhw)		(((synhw).model_id >> 16) & 0x3f)
 #define SYN_MODEL_HARDWARE(synhw)	(((synhw).model_id >> 9) & 0x7f)
 #define SYN_MODEL_NEWABS(synhw)		((synhw).model_id & (1 << 7))