--- /dev/null
+# namespace http\Client\Curl\Versions
+
+CURL version constants.
+
+> ***NOTE:***
+> These constants have been added in v2.6.0, resp. v3.1.0.
+
+## Constants:
+
+* CURL
+ Version string of libcurl, e.g. "7.50.0".
+* SSL
+ Version string of the SSL/TLS library, e.g. "OpenSSL/1.0.2h".
+* LIBZ
+ Version string of the zlib compression library, e.g. "1.2.8".
+* ARES
+ Version string of the c-ares library, e.g. "1.11.0".
+* IDN
+ Version string of the IDN library, e.g. "1.32".