diff --git a/soc/st/stm32/Kconfig.defconfig b/soc/st/stm32/Kconfig.defconfig
index 0741439de6c..67879e6cf62 100644
--- a/soc/st/stm32/Kconfig.defconfig
+++ b/soc/st/stm32/Kconfig.defconfig
@@ -7,6 +7,8 @@
 
 if SOC_FAMILY_STM32
 
+# Source series Kconfig files first, so SoCs
+# can override the defaults given here
 rsource "*/Kconfig.defconfig"
 
 config CLOCK_CONTROL