diff --git a/project/dfu/secure_bootloader/pca10056_s140_ble/config/sdk_config.h b/project/dfu/secure_bootloader/pca10056_s140_ble/config/sdk_config.h
index fce4296..b944b18 100644
--- a/project/dfu/secure_bootloader/pca10056_s140_ble/config/sdk_config.h
+++ b/project/dfu/secure_bootloader/pca10056_s140_ble/config/sdk_config.h
@@ -141,6 +141,7 @@
 // <i> to immediately transfer a new application if it wishes.
 
 #ifndef NRF_BL_DFU_CONTINUATION_TIMEOUT_MS
+/* Time to wait for an expected DFU update immediately after entering DFU mode from the application. (10 seconds) */
 #define NRF_BL_DFU_CONTINUATION_TIMEOUT_MS 10000
 #endif
 
@@ -150,7 +151,8 @@
 // <i> If 0, no inactivity timer will be used. Values 1-99 are invalid.
 
 #ifndef NRF_BL_DFU_INACTIVITY_TIMEOUT_MS
-#define NRF_BL_DFU_INACTIVITY_TIMEOUT_MS 120000
+/* Time to stay in DFU mode after the last DFU activity before returning to the application. (60 seconds) */
+#define NRF_BL_DFU_INACTIVITY_TIMEOUT_MS 60000
 #endif
 
 // </h>