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tool/README.md

@@ -3,6 +3,8 @@ AWS-LC features enhanced benchmarking tools compatible with OpenSSL and BoringSS
 
 ## Speed tool
 
+The speed subtool of `bssl` runs a performance test for a number of cryptographic operations (which can be implemented using different APIs). Each operation is mapped to a "filter name". Below we list the filter name, which operation it maps to and which API is used to implement it.
+
 |  Filter name  |  Description  | Function family |
 | ------------- | ------------- | -------------
 | EVP ECDH {P-224, P-256, P-384, P-521, secp256k1, X25519} | ECDHE key agreement for one party | EVP |