diff --git a/.env.example b/.env.example
index 70d448f..bae7b8e 100644
--- a/.env.example
+++ b/.env.example
@@ -1,4 +1,7 @@
+# From legacy token page: https://api.slack.com/custom-integrations/legacy-tokens
 SLACK_API_TOKEN=xoxp-_______________________________________________
+# From account page: https://airtable.com/account
 AIRTABLE_KEY=key______________
+# From URL of your base: https://airtable.com/api
 AIRTABLE_APP=app_____________
 AIRTABLE_BASE="Channel List copy"
diff --git a/Gemfile b/Gemfile
index 3d14b7a..67c693a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,4 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'rack'
+gem 'rake'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7f22695..20e1946 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -57,7 +57,7 @@ DEPENDENCIES
   minitest (~> 5.0)
   prog-channels!
   rack
-  rake (~> 10.0)
+  rake
 
 BUNDLED WITH
    1.14.6
diff --git a/README.md b/README.md
index e961ede..fbeb874 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,9 @@ There's also a rake task that will simply run `bin/sync`:
 
     rake prog:channels:sync
 
+**Note:** Check out the comments in [`.env.example`](.env.example) for
+details on where to get each credential for configuration.
+
 ## Testing
 
 Integration tests essentially check that the tokens for Slack and for Airtable are set and are valid.