diff --git a/Ubuntu-16.04-Root-on-ZFS.md b/Ubuntu-16.04-Root-on-ZFS.md
index 86ba635..f0473fe 100644
--- a/Ubuntu-16.04-Root-on-ZFS.md
+++ b/Ubuntu-16.04-Root-on-ZFS.md
@@ -351,6 +351,7 @@ Choose one of the following options.  If you are going to do an encrypted home d
 
 7.2b  Create an encrypted swap device:
 
+    # apt install cryptsetup
     # echo cryptswap1 /dev/zvol/rpool/swap /dev/urandom \
           swap,cipher=aes-xts-plain64:sha256,size=256 >> /etc/crypttab
     # systemctl daemon-reload
diff --git a/Ubuntu-16.10-Root-on-ZFS.md b/Ubuntu-16.10-Root-on-ZFS.md
index 8b5e7de..975037e 100644
--- a/Ubuntu-16.10-Root-on-ZFS.md
+++ b/Ubuntu-16.10-Root-on-ZFS.md
@@ -347,6 +347,7 @@ Choose one of the following options.  If you are going to do an encrypted home d
 
 7.2b  Create an encrypted swap device:
 
+    # apt install cryptsetup
     # echo cryptswap1 /dev/zvol/rpool/swap /dev/urandom \
           swap,cipher=aes-xts-plain64:sha256,size=256 >> /etc/crypttab
     # systemctl daemon-reload
diff --git a/Ubuntu-17.04-Root-on-ZFS.md b/Ubuntu-17.04-Root-on-ZFS.md
index ba81981..3df8a97 100644
--- a/Ubuntu-17.04-Root-on-ZFS.md
+++ b/Ubuntu-17.04-Root-on-ZFS.md
@@ -362,6 +362,7 @@ Choose one of the following options.  If you are going to do an encrypted home d
 
 7.2b  Create an encrypted swap device:
 
+    # apt install cryptsetup
     # echo cryptswap1 /dev/zvol/rpool/swap /dev/urandom \
           swap,cipher=aes-xts-plain64:sha256,size=256 >> /etc/crypttab
     # systemctl daemon-reload