diff --git a/nodes/src/co2_level.h b/nodes/src/co2_level.h
index 75dc059..8b9400c 100644
--- a/nodes/src/co2_level.h
+++ b/nodes/src/co2_level.h
@@ -23,7 +23,7 @@ enum error_code co2_lvl_init();
 *   @return     read_failed upon any error occuring during measurement
 *   @return     success     otherwise
 *   @note       the content of holder should not be trusted upon returning something else than success
-*   @note       for the first measurements after a reboot, holder will contain the value 0xffffffff
+*   @note       the value is not read for the first few measurements after a reboot
 */
 enum error_code co2_lvl_get_value(int* holder);