diff --git a/include/sds011read.h b/include/sds011read.h
index 734395a7..d278a5fd 100644
--- a/include/sds011read.h
+++ b/include/sds011read.h
@@ -11,5 +11,7 @@
 
 bool sds011_init();
 void sds011_loop();
+void sds011_sleep(void);
+void sds011_wakeup(void);
 
 #endif // _SDS011READ_H