diff --git a/README.md b/README.md
index 2ebde58..7ca52f0 100644
--- a/README.md
+++ b/README.md
@@ -12,8 +12,9 @@ Generally, installing from source (see section `Source Installation from Git`) l
 
 ## Role Variables
 
-TODO.
+    certbot_install_method: package
 
+Controls how Certbot is installed. Available options are 'package', 'snap', and 'source'.
 
     certbot_auto_renew: true
     certbot_auto_renew_user: "{{ ansible_user | default(lookup('env', 'USER')) }}"
diff --git a/tasks/install-with-snap.yml b/tasks/install-with-snap.yml
index dfdcbc2..8b79099 100644
--- a/tasks/install-with-snap.yml
+++ b/tasks/install-with-snap.yml
@@ -11,7 +11,7 @@
 
 - name: Enable classic snap support.
   file:
-    source: /var/lib/snapd/snap
+    src: /var/lib/snapd/snap
     dest: /snap
     state: link
 
@@ -22,6 +22,6 @@
 
 - name: Symlink certbot into place.
   file:
-    source: /snap/bin/certbot
+    src: /snap/bin/certbot
     dest: /usr/bin/certbot
     state: link