diff --git a/README.md b/README.md
index 81aa3d7..411e0a2 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,8 @@ to test:
 
 ## Erlang integration
 
+### Ports version
+
 The binary `erl_ecrecover` works with Erlang Ports to provice ecrecover to an Erlang process. The file `src/ecrecover.erl` has the necessary Erlang code. Run it like this:
 
 ```
@@ -33,3 +35,14 @@ You may test if from the command line using the file `data/data/erl_ecrecover.in
 $ cat data/erl_ecrecover.input.bin | ./erl_ecrecover
 @000000000000000000000000c08b5542d177ac6686946920409741463a15dddb$
 ```
+
+### NIF version
+
+The shared library also supports NIF. Use the erlang file `sec/nifecrecover.erl` to use this:
+
+```
+c("src/nifecrecover").
+Decoded = nifecrecover:hexstr_to_bin("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").
+nifecrecover:ecrecover(Decoded).
+nifecrecover:time_taken_to_execute(fun() -> nifecrecover:ecrecover(Decoded) end).
+```
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