diff --git a/include/configs/apalis_t30.h b/include/configs/apalis_t30.h
index bf0aefda2a..f0c003d2fe 100644
--- a/include/configs/apalis_t30.h
+++ b/include/configs/apalis_t30.h
@@ -12,7 +12,14 @@
 
 #include "tegra30-common.h"
 
-/* Board-specific serial config */
+/*
+ * Board-specific serial config
+ *
+ * Apalis UART1: NVIDIA UARTA
+ * Apalis UART2: NVIDIA UARTD
+ * Apalis UART3: NVIDIA UARTB
+ * Apalis UART4: NVIDIA UARTC
+ */
 #define CONFIG_TEGRA_ENABLE_UARTA
 #define CONFIG_SYS_NS16550_COM1		NV_PA_APB_UARTA_BASE
 
diff --git a/include/configs/colibri_t30.h b/include/configs/colibri_t30.h
index fa0fa93b03..94802a66f7 100644
--- a/include/configs/colibri_t30.h
+++ b/include/configs/colibri_t30.h
@@ -14,7 +14,13 @@
 
 /* High-level configuration options */
 
-/* Board-specific serial config */
+/*
+ * Board-specific serial config
+ *
+ * Colibri UART-A: NVIDIA UARTA
+ * Colibri UART-B: NVIDIA UARTD
+ * Colibri UART-C: NVIDIA UARTB
+ */
 #define CONFIG_TEGRA_ENABLE_UARTA
 #define CONFIG_SYS_NS16550_COM1		NV_PA_APB_UARTA_BASE