Update README

curl/README.md

@@ -11,7 +11,7 @@ This directory contains a Dockerfile that builds `curl` using OpenSSL v3 using t
 ## More details
 
 The Dockerfile 
-- obtains all source code required for building the quantum-safe crypto (QSC) algorithms, the QSC-enabled oqs-provider, curl (v.7.87.0) and the latest OpenSSL (master) code
+- obtains all source code required for building the quantum-safe crypto (QSC) algorithms, the QSC-enabled oqs-provider, curl, and OpenSSL
 - builds all libraries and applications
 - creates OQS-enabled certificate files for a mini-root certificate authority (CA) 
 - creates an OQS-enabled server certificate for running a `localhost` QSC-TLS server
@@ -49,14 +49,17 @@ Information how to use the image is [available in the separate file USAGE.md](US
 
 The Dockerfile provided allows for significant customization of the image built:
 
+### OPENSSL_TAG
+
+Tag of `openssl` release to be used.
 
 ### LIBOQS_TAG
 
-Tag of `liboqs` release to be used. Default "main".
+Tag of `liboqs` release to be used.
 
 ### OQSPROVIDER_TAG
 
-Tag of `oqsprovider` release to be used. Default "main".
+Tag of `oqsprovider` release to be used.
 
 ### LIBOQS_BUILD_DEFINES
 
@@ -94,3 +97,6 @@ Allow setting parameters to `make` operation, e.g., '-j nnn' where nnn defines t
 
 The default is conservative and known not to overload normal machines. If one has a very powerful (many cores, >64GB RAM) machine, passing larger numbers (or only '-j' for maximum parallelism) speeds up building considerably.
 
+### ALPINE_VERSION
+
+The version of the `alpine` docker image to to be used.