Address code review feedback

README.md

@@ -6,6 +6,26 @@ There is a `Makefile` that contains some useful command shortcuts for typical de
 
 To see a current list of commands, run `make help`.
 
+### Generating cassettes for tests
+
+We use [VCR](https://github.com/vcr/vcr) to record transactions with remote systems for testing. This includes the rake
+task for reloading Detector::SuggestedResource records, which do not yet have a standard provider. For the initial
+feature development, we have used a Lando environment with the following definition:
+
+```yml
+name: static
+recipe: lamp
+config:
+  webroot: .
+```
+
+If you need to regenerate these cassettes, the following procedure should be sufficient:
+
+1. Use the configuration above to ensure the needed files are visible at `http://static.lndo.site/filename.ext`.
+2. Delete any existing cassette files which need to be regenerated.
+3. Run the test(s).
+4. Commit the resulting files along with your other work.
+
 ## Environment Variables
 
 ### Required

app/models/detector/suggested_resource.rb

@@ -59,7 +59,8 @@ def calculate_fingerprint(old_phrase)
     # @note This method is called by the suggested_resource:reload rake task.
     #
     # @param input [CSV::Table] An imported CSV file containing all Suggested Resource records. The CSV file must have
-    #                           at least three headers, named "Title", "URL", and "Phrase".
+    #                           at least three headers, named "Title", "URL", and "Phrase". Please note: these values
+    #                           are case sensitive.
     def self.bulk_replace(input)
       raise ArgumentError.new, 'Tabular CSV is required' unless input.instance_of?(CSV::Table)