diff --git a/t430/README.md b/t430/README.md
index db755ee..6069a68 100644
--- a/t430/README.md
+++ b/t430/README.md
@@ -116,6 +116,7 @@ or ethernet to `sudo apt-get install flashrom`
 | 7 | *not used* | *not used* |
 | 8 | 3.3V |  |
 
+**Warning**: Connect the 3.3v only once everything else is connected and the Raspberry Pi is running. Then plugin the 3.3V pin ( pin 8 on the chip ) into pin 1 on the Raspberry Pi.
 
 Connect corresponding RPI Pins, according to the images above.
 
diff --git a/t440p/README.md b/t440p/README.md
index 81b4f87..6cc7adf 100644
--- a/t440p/README.md
+++ b/t440p/README.md
@@ -1,3 +1,5 @@
+**Warning**: Connect the 3.3v only once everything else is connected and the Raspberry Pi is running. Then plugin the 3.3V pin ( pin 8 on the chip ) into pin 1 on the Raspberry Pi.
+
 # Skulls - [Thinkpad T440P](https://pcsupport.lenovo.com/us/zh/products/laptops-and-netbooks/thinkpad-t-series-laptops/thinkpad-t440p)
 
 ![front_bootsplash](front.jpg)
@@ -113,6 +115,7 @@ or ethernet to `sudo apt-get install flashrom`
 | 7 | *not used* | *not used* |
 | 8 | 3.3V |  |
 
+**Warning**: Connect the 3.3v only once everything else is connected and the Raspberry Pi is running. Then plugin the 3.3V pin ( pin 8 on the chip ) into pin 1 on the Raspberry Pi.
 
 Connect corresponding RPI Pins, according to the images above.
 
diff --git a/x230/README.md b/x230/README.md
index 4af372b..4235e3b 100644
--- a/x230/README.md
+++ b/x230/README.md
@@ -155,10 +155,13 @@ or ethernet to `sudo apt-get install flashrom`
 | 8 | 3.3V |  |
 
 
+**Warning**: Connect the 3.3v only once everything else is connected and the Raspberry Pi is running. Then plugin the 3.3V pin ( pin 8 on the chip ) into pin 1 on the Raspberry Pi.
+ 
 Connect corresponding RPI Pins, according to the images above.
 
 ![Raspberry Pi at work](rpi_clip.jpg)
 
+
 Now copy the Skulls release tarball over to the Rasperry Pi and
 [continue](#unpack-the-skulls-release-archive) on the Pi.
 
diff --git a/x230t/README.md b/x230t/README.md
index 3e80eed..52760fa 100644
--- a/x230t/README.md
+++ b/x230t/README.md
@@ -154,6 +154,7 @@ or ethernet to `sudo apt-get install flashrom`
 | 7 | *not used* | *not used* |
 | 8 | 3.3V |  |
 
+**Warning**: Connect the 3.3v only once everything else is connected and the Raspberry Pi is running. Then plugin the 3.3V pin ( pin 8 on the chip ) into pin 1 on the Raspberry Pi.
 
 Connect corresponding RPI Pins, according to the images above.