diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 524162b68..21d2b6a57 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         body:
-          - README.md
+          - file://README.md
           - Test of action completed successfully!
     steps:
       - name: Checkout
diff --git a/README.md b/README.md
index 6d1b46664..cd6e09291 100644
--- a/README.md
+++ b/README.md
@@ -13,10 +13,10 @@ An action that simply sends a mail to multiple recipients.
     username: ${{secrets.MAIL_USERNAME}}
     password: ${{secrets.MAIL_PASSWORD}}
     subject: Github Actions job result
-    # Literal body
+    # Literal body:
     body: Build job of ${{github.repository}} completed successfully!
     # Read file contents as body:
-    body: README.md
+    body: file://README.md
     to: obiwan@tatooine.com,yoda@dagobah.com
     from: Luke Skywalker
 ```
diff --git a/main.rb b/main.rb
index 10901b927..7c0f3c13d 100755
--- a/main.rb
+++ b/main.rb
@@ -14,7 +14,13 @@
 from = ENV['INPUT_FROM']
 
 # Body
-body = File.exist?(body) ? File.read(body) : body
+prefix = 'file://'
+body = if body.start_with?(prefix)
+         path = body.delete_prefix(prefix)
+         File.read(path)
+       else
+         body
+       end
 
 # Message
 message = <<~END_OF_MESSAGE