-PPRINT_PROP_BOOL([Debug mode], $BABELTRACE_DEBUG_MODE)
-PPRINT_PROP_BOOL([Developer mode], $BABELTRACE_DEV_MODE)
+PPRINT_PROP_BOOL_CUSTOM([Debug mode], $BABELTRACE_DEBUG_MODE, [To enable, set the BABELTRACE_DEBUG_MODE environment variable to 1])
+PPRINT_PROP_BOOL_CUSTOM([Developer mode], $BABELTRACE_DEV_MODE, [To enable, set the BABELTRACE_DEV_MODE environment variable to 1])