diff --git a/1pass b/1pass
index 7193f5d..12d1a85 100755
--- a/1pass
+++ b/1pass
@@ -21,7 +21,7 @@
 set -e
 set -o pipefail
 
-VERSION="1.0.1"
+VERSION="1.1"
 
 if [ "$XDG_CONFIG_HOME" != "" ] && [ ! -d "${HOME}/.1pass" ]; then
     op_dir="${XDG_CONFIG_HOME}/1pass"
@@ -127,11 +127,25 @@ With no arguments, prints a list of all Logins and Passwords in all 1Password va
 With a single argument, fetches the Item (Login, Password, or TOTP) matching the
 given name, and copies the resulting password to the clipboard.
 
-With two arguments, fetches the specified field (e.g.) "usernmae" from the named
+With two arguments, fetches the specified field (e.g.) "username" from the named
 item, and copies the results to the clipboard.
 USAGE
 }
 
+sanity_check()
+{
+    for cmd in "op" "jq" "gpg" "expect"
+    do
+        if [ $verbose -eq 1 ]; then
+            echo "checking for $cmd"
+        fi
+        if [ ! -x "`which $cmd`" ]; then
+            echo "Cannot find the '$cmd' command. Please make sure it is installed"
+            exit 1
+        fi
+    done
+}
+
 signin()
 {
     local pw=$(gpg -d -q $master)
@@ -139,14 +153,30 @@ signin()
     if [ $verbose -eq 1 ]; then
         echo "signing in to ${domain} $email"
     fi
-    local token=$(echo -n "${pw}" | op signin --output=raw ${domain} $email $se || echo -n "_fail_")
-    if [ "$token" == "_fail_" ]; then
+    local script="
+        spawn op signin ${domain} ${email} ${se}
+        expect \"${domain}:\"
+        send \"${pw}\n\"
+        expect {
+               \"Enter your six-digit authentication code:\" {
+                       puts -nonewline stderr \"Enter your six-digit authentication code: \"
+                       flush stderr
+                       interact -o \"\r\" return
+                       puts stderr \"\"
+                       exp_continue
+               }
+               eof
+        }
+    "
+    local output0=$(expect -c "${script}")
+    local output=$(echo "${output0}" | grep "export" || echo -n "_fail_")
+    if [ "$output" == "_fail_" ]; then
         echo "1pass failed to signin to ${domain}"
         exit 1
     fi
+    # extract token from 'export OP_SESSION_domain="asdsad"'
+    local token=$(expr "${output}" : '.*="\(.*\)"')
     echo -n "${token}" | gpg -qe --batch -r $self_key > $session
-    # also export it in case we use the op command in the shell:
-    export $OP_SESSION_NAME=$token
 }
 
 init_session()
@@ -363,6 +393,8 @@ done
 
 shift $((OPTIND-1))
 
+sanity_check
+
 if [ $# -eq 0 ]; then
     list_items
 elif [ $# -eq 1 ]; then
diff --git a/README.md b/README.md
index c0157b5..975f020 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,12 @@
 **1pass** is a caching wrapper for the [1Password
 CLI](https://support.1password.com/command-line-getting-started/) `op`.
 
+## UPGRADE NOTE
+
+Upgrading to version 1.1 requires installation of the
+[expect](https://core.tcl.tk/expect/index) tool. `1pass` will check for this (and
+other) dependencies and remind you to install them.
+
 ## Introduction
 
 **1pass** is designed to make using your 1Password usernames and passwords quick and easy. It is
@@ -34,11 +40,14 @@ Together these features enable easy use of 1Password-stored credentials.
 ## Installation
 
 First make sure that the `op` [1Password
-CLI](https://support.1password.com/command-line-getting-started/) and the `jq` [JQ](https://stedolan.github.io/jq) are installed. If you use homebrew cask on Mac OS X, this works well:
+CLI](https://support.1password.com/command-line-getting-started/) and the `jq`
+[JQ](https://stedolan.github.io/jq) and
+[expect](https://core.tcl.tk/expect/index) requirements are installed. If you use
+homebrew cask on Mac OS X, this works well:
 
 ```sh
 $ brew cask install 1password-cli
-$ brew install jq
+$ brew install jq expect
 ```
 
 Copy the 1pass executable file to a suitable location on your PATH (for example, /usr/local/bin)
@@ -167,6 +176,8 @@ $ 1pass -p MyBankAccount pin
 
 **1pass** has special support for TOTP fields -- these are fetched directly via `op`
 rather than a local cache. (Thanks to (@ev0rtex)[https://github.com/ev0rtex]).
+Note that this **is different** from using TOTP 2FA to log into your 1Password
+account (that is supported too -- see below)
 
 ```sh
 $ 1pass -p MyBankAccount totp
@@ -197,6 +208,14 @@ from the online 1Password vault.
 Similarly, 1Password CLI sessions last for 30 minutes from the time of last use. **1pass** will
 manage the session for you, and refresh it as needed.
 
+## 2FA for 1Password
+
+If you have turned on two-factor authentication (2FA) support for your 1Password
+account, then 1pass will prompt for you to enter a TOTP code when creating a
+session. Currently, you will need to re-enter this code after every session
+expiration (30 minutes of inactivity). Unfortunately this makes using 1pass in
+non-interactive scripts less useful.
+
 ## License
 
 Copyright (c) 2017, David Creemer (twitter: [@dcreemer](https://twitter.com/dcreemer)) with some