diff --git a/Clues/What/clue.js b/Clues/What/clue.js
index 7a85ba9..1b456ac 100644
--- a/Clues/What/clue.js
+++ b/Clues/What/clue.js
@@ -1,6 +1,6 @@
 console.log(`Here's what you need to do:
-1. Touch a file called answer.txt by typing: 
+1. Create a file called answer.txt by typing:
 touch answer.txt
 2. Check this by listing all the files in this folder:
 ls -a
-2. Now change directory to the Who folder and find the answer`)
\ No newline at end of file
+2. Now change directory to the Who folder and find the answer`)
diff --git a/Clues/Where/clue.js b/Clues/Where/clue.js
index c50fd53..9507b67 100644
--- a/Clues/Where/clue.js
+++ b/Clues/Where/clue.js
@@ -1,5 +1,5 @@
 console.log(`You got here by typing a relative path.
 Learn more about changing directory here: 
-https://alligator.io/workflow/command-line-basics-changing-directories/
+https://phoenixnap.com/kb/linux-cd-command
 Now change directory to ./How and get your next clue.
-`)
\ No newline at end of file
+`)
diff --git a/Clues/Who/clue.js b/Clues/Who/clue.js
index 53983a3..7451e60 100644
--- a/Clues/Who/clue.js
+++ b/Clues/Who/clue.js
@@ -1,3 +1,20 @@
+let shaCommand;
+switch (process.platform) {
+  case "darwin":
+    shaCommand = "shasum -a 256 answer.txt";
+    break;
+  case "linux":
+    shaCommand = "sha256sum answer.txt";
+    break;
+  case "win32":
+    shaCommand = "certutil -hashfile answer.txt SHA256"
+    break;
+  default:
+    console.log(`Oh no, we didn't recognise your operating system, process.platform = ${process.platform}`);
+    process.exit(1);
+    break;
+}
+
 console.log(`Who is never gonna give you up?
 Never gonna take you down?
 Never gonna run around and desert you?
@@ -6,4 +23,10 @@ Put your answer in the answer.txt file you created.
 echo "ANSWER HERE" > answer.txt
 Now move this file to the Answer folder.
 How will you achieve this? Stay in the command line. (You can Google.)
-`)
\ No newline at end of file
+
+When you're done, run:
+
+${shaCommand}
+
+And paste the output into Slack thread 🧵 (create a new thread if there isn't one already).
+`)