diff --git a/configs/ZUMspot_Libre.h b/configs/ZUMspot_Libre.h
index f7b8d62..4e7142d 100644
--- a/configs/ZUMspot_Libre.h
+++ b/configs/ZUMspot_Libre.h
@@ -24,6 +24,8 @@
 // #define PI_HAT_7021_REV_03
 // 2) ZUMspot Libre Kit or board with modified RF7021SE and Blue Pill STM32F103:
 #define ADF7021_CARRIER_BOARD
+// 3) MMDVM_HS_Hat revisions 1.1 and 1.2 (DB9MAT & DF2ET)
+// #define MMDVM_HS_HAT_REV12
 
 // Enable ADF7021 support:
 #define ENABLE_ADF7021
diff --git a/configs/ZUMspot_RPi.h b/configs/ZUMspot_RPi.h
index 0d26f22..45e1952 100644
--- a/configs/ZUMspot_RPi.h
+++ b/configs/ZUMspot_RPi.h
@@ -24,6 +24,8 @@
 #define PI_HAT_7021_REV_03
 // 2) ZUMspot Libre Kit or board with modified RF7021SE and Blue Pill STM32F103:
 // #define ADF7021_CARRIER_BOARD
+// 3) MMDVM_HS_Hat revisions 1.1 and 1.2 (DB9MAT & DF2ET)
+// #define MMDVM_HS_HAT_REV12
 
 // Enable ADF7021 support:
 #define ENABLE_ADF7021
diff --git a/configs/ZUMspot_USB.h b/configs/ZUMspot_USB.h
index 41b9d26..5e6d098 100644
--- a/configs/ZUMspot_USB.h
+++ b/configs/ZUMspot_USB.h
@@ -24,6 +24,8 @@
 #define PI_HAT_7021_REV_03
 // 2) ZUMspot Libre Kit or board with modified RF7021SE and Blue Pill STM32F103:
 // #define ADF7021_CARRIER_BOARD
+// 3) MMDVM_HS_Hat revisions 1.1 and 1.2 (DB9MAT & DF2ET)
+// #define MMDVM_HS_HAT_REV12
 
 // Enable ADF7021 support:
 #define ENABLE_ADF7021
diff --git a/configs/ZUMspot_duplex.h b/configs/ZUMspot_duplex.h
index 86a234f..d04bbf0 100644
--- a/configs/ZUMspot_duplex.h
+++ b/configs/ZUMspot_duplex.h
@@ -24,6 +24,8 @@
 // #define PI_HAT_7021_REV_03
 // 2) ZUMspot Libre Kit or board with modified RF7021SE and Blue Pill STM32F103:
 #define ADF7021_CARRIER_BOARD
+// 3) MMDVM_HS_Hat revisions 1.1 and 1.2 (DB9MAT & DF2ET)
+// #define MMDVM_HS_HAT_REV12
 
 // Enable ADF7021 support:
 #define ENABLE_ADF7021