diff --git a/README.md b/README.md
index 8b47f89..dc4055d 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ sh CocoASAIS
 
 You can use `-d` or `-f` to debug.
 
+The script only supports UEFI boot mode.
+
 ## Contributing <a name="contributing"></a>
 PRs are welcome.
 
diff --git a/install.sh b/install.sh
index 45d7b32..42f2219 100755
--- a/install.sh
+++ b/install.sh
@@ -58,6 +58,12 @@ partDisks() {
     if [ $? -eq 1 ]; then
         calcHeightAndRun "whiptail --msgbox \"You will partition the disk yourself with gdisk and then, when finished, you will continue with the installation.\" HEIGHT 62 3>&1 1>&2 2>&3"
         gdisk $disk
+        parts=$(lsblk /dev/sdb -nl | wc -l)
+        if [ $parts -eq 1 ]; then
+            whiptail --msgbox "You must at least create boot and root partitions." 0 0
+            logStep "partDisks"
+            exit 1
+        fi
         # TODO: Ask for home partition
         formatOptions $(lsblk ${disk} -pnlo NAME,SIZE,MOUNTPOINTS | sed -n '2~1p')
         result=$(whiptail --title "Select the boot partition." --menu "" 0 0 0 "${options[@]}" 3>&1 1>&2 2>&3)