diff --git a/doc/main.md b/doc/main.md
index b1338e6e..d4019f1d 100644
--- a/doc/main.md
+++ b/doc/main.md
@@ -19,6 +19,33 @@ You might want to check out
 [libcoap-minimal](https://github.com/obgm/libcoap-minimal) for usage
 examples.
 
+The following RFCs are supported
+
+* RFC7252: The Constrained Application Protocol (CoAP)
+
+* RFC7641: Observing Resources in the Constrained Application Protocol (CoAP)
+
+* RFC7959: Block-Wise Transfers in the Constrained Application Protocol (CoAP)
+
+* RFC7967: Constrained Application Protocol (CoAP) Option for No Server Response
+
+* RFC8132: PATCH and FETCH Methods for the Constrained Application Protocol (CoAP)
+
+* RFC8323: CoAP (Constrained Application Protocol) over TCP, TLS, and WebSockets
+  [No WebSockets support]
+
+* RFC8768: Constrained Application Protocol (CoAP) Hop-Limit Option
+
+There is (D)TLS support for the following libraries
+
+* OpenSSL (Minimum version 1.1.0) [PKI, PSK and PKCS11]
+
+* GnuTLS (Minimum version 3.3.0) [PKI, PSK, RPK(3.6.6+) and PKCS11]
+
+* Mbed TLS (Minimum version 2.7.10) [PKI and PSK] [Currently only DTLS]
+
+* TinyDTLS [PSK and RPK] [DTLS Only]
+
 Documentation
 =============