diff --git a/src/target/stm32f1.c b/src/target/stm32f1.c
index 1dca3098ccc..42f0ec341c0 100644
--- a/src/target/stm32f1.c
+++ b/src/target/stm32f1.c
@@ -146,25 +146,25 @@ bool gd32f1_probe(target_s *target)
 	size_t block_size = 0x400;
 
 	switch (device_id) {
-	case 0x414U: /* Gigadevice gd32f303 */
-	case 0x430U: /* XL-density */
+	case 0x414U: /* GD32F30x_HD, High density */
+	case 0x430U: /* GD32F30x_XD, XL-density */
 		target->driver = "GD32F3";
 		block_size = 0x800;
 		break;
-	case 0x418U:
+	case 0x418U: /* Connectivity Line */
 		target->driver = "GD32F2";
 		block_size = 0x800;
 		break;
-	case 0x410U: /* Gigadevice gd32f103, gd32e230 */
+	case 0x410U: /* Medium density */
 		if ((target->cpuid & CORTEX_CPUID_PARTNO_MASK) == CORTEX_M23)
-			target->driver = "GD32E230";
+			target->driver = "GD32E230"; /* GD32E230, 64 KiB max in 1 KiB pages */
 		else if ((target->cpuid & CORTEX_CPUID_PARTNO_MASK) == CORTEX_M4) {
 			target->driver = "GD32F3";
 			block_size = 0x800;
 		} else
-			target->driver = "GD32F1";
+			target->driver = "GD32F1"; /* GD32F103, 1 KiB pages */
 		break;
-	case 0x444U: /* Gigadevice gd32e50x */
+	case 0x444U: /* GD32E50x_CL, 512 KiB max in 8 KiB pages */
 		target->driver = "GD32E5";
 		block_size = 0x2000;
 		break;