diff --git a/openocd.cfg b/openocd.cfg
index 74c9af9..81551c8 100644
--- a/openocd.cfg
+++ b/openocd.cfg
@@ -1,2 +1,12 @@
+# Sample OpenOCD configuration for the STM32F3DISCOVERY development board
+
+# Depending on the hardware revision you got you'll have to pick ONE of these
+# interfaces. At any time only one interface should be commented out.
+
+# Revision C (newer revision)
 source [find interface/stlink-v2-1.cfg]
+
+# Revision A and B (older revisions)
+# source [find interface/stlink-v2.cfg]
+
 source [find target/stm32f3x.cfg]