diff --git a/en/building.md b/en/building.md
index d59bf5c..0b50c2d 100644
--- a/en/building.md
+++ b/en/building.md
@@ -112,6 +112,9 @@ Connect again to the camera and run this command (same as -n in the previous com
 firstboot
 ```
 
+Remember! The user and password will be reset to default in most cases (the default is usually root/12345)
+
+
 Anatomy of the project
 ----------------------
 
@@ -185,6 +188,8 @@ If re-creating the root filesystem in necessary, one should in addition run
 Run `make br-linux-rebuild br-all` to rebuild Linux kernel image,
 `make br-busybox-rebuild br-all` to rebuild busybox and pack it into a rootfs image.
 
+Remember! the name of the package in the two commands above is the folder name of your package, not the package name you set in Config.in file
+
 Making changes to Buildroot packages
 ------------------------------------