diff --git a/components/bootloader/Kconfig.projbuild b/components/bootloader/Kconfig.projbuild
index 282b68c6a7..306e4dcd3c 100644
--- a/components/bootloader/Kconfig.projbuild
+++ b/components/bootloader/Kconfig.projbuild
@@ -893,6 +893,8 @@ menu "Security features"
                 It is also possible to enable secure download mode at runtime by calling
                 esp_efuse_enable_rom_secure_download_mode()
 
+                Note: Secure Download mode is not available for ESP32 (includes revisions till ECO3).
+
         config SECURE_INSECURE_ALLOW_DL_MODE
             bool "UART ROM download mode (Enabled (not recommended))"
             help