mirror of https://referencesource.org/file-format-signatures/

README.md

@@ -25,7 +25,7 @@ Machine-readable: https://referencesource.org/file-format-signatures/data.json
   it re-verifies on a cadence this snapshot does not)
 - **Records:** 337
 
-The leading bytes (magic number / file signature) that identify a file format, with its usual extension. Answers 'what actually is this file' when the extension is wrong or missing.
+The leading bytes (magic number / file signature) that identify a file format, with its usual extension. Answers 'what actually is this file' when the extension is wrong or missing. Covers what Wikipedia's List of file signatures publishes — a broad cross-section, not every format that exists.
 
 ## Provenance — what every record carries