diff --git a/_pages/en_US/2.1.0-ctrtransfer.txt b/_pages/en_US/2.1.0-ctrtransfer.txt
index e8d180f26b..37f3a46ec8 100644
--- a/_pages/en_US/2.1.0-ctrtransfer.txt
+++ b/_pages/en_US/2.1.0-ctrtransfer.txt
@@ -28,6 +28,15 @@ Your device may not show your installed games after the ctrtransfer. This is due
 **Never update a New 3DS running 2.1.0 (an Old 3DS firmware) or you will BRICK! You MUST restore a NAND backup or ctrtransfer back to standard New 3DS firmware first!**
 {: .notice--danger}
 
+{% capture notice %}
+**Putting a New 3DS on 2.1.0 in sleep mode is known to cause an UNRECOVERABLE brick!**
+**This only happens when shutting the lid _while the device is on_; this does not apply to turning the device off.**
+**The device only enters sleep mode when the lid is closed. It is not on a timer or anything like that.**
+**Once on 2.1.0, you should continue without delay to avoid any possibility of this happening!**
+{% endcapture %}
+
+<div class="notice--danger">{{ notice | markdownify }}</div>
+
 #### Overview of steps
 
 In this section, we will be flashing your console's [CTRNAND](https://www.3dbrew.org/wiki/Flash_Filesystem#CTR_partition) partition to 2.1.0 in order to take advantage of an oversight in 2.1.0 for the purpose of extracting the [OTP](https://www.3dbrew.org/wiki/OTP_Registers) unique to your console. This OTP file is required to install arm9loaderhax, and **cannot** be shared with other consoles.