Update README.md

kokke · Oct 16, 2024 · b371993 · b371993
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 ### Tiny HMAC in C
 
-This is a small and portable implementation of the [HMAC algorithm](https://en.wikipedia.org/wiki/HMAC) written in C.
+This is a small and portable implementation of the [HMAC algorithm](https://en.wikipedia.org/wiki/HMAC) written in C. 
+
+This implementation only supports the [SHA-1 digest](https://en.wikipedia.org/wiki/SHA-1) currently.
 
 Description from Wikipedia (emphasis added):