Tweak library requirements in PLATFORMS.md

diff --git a/PLATFORMS.md b/PLATFORMS.md
index 6a3d052dbd3064ee12228ee90bb583abee8b273a..477f23b86a40be7c574bb2f0d7700d637825f6fd 100644 (file)
--- a/PLATFORMS.md
+++ b/PLATFORMS.md
@@ -16,9 +16,12 @@ IPv6 support, and POSIX-compliant threads, plus the following mandatory
 libraries:
 
 - `libuv` for asynchronous I/O operations and event loops
-- `libssl` and `libcrpyto` from OpenSSL for cryptography
-- `libjemalloc` for memory allocation
-- `libnghttp2` for HTTP/2
+- `libssl` and `libcrypto` from OpenSSL for cryptography
+
+Use of the following libraries is optional:
+
+- `libjemalloc` for improved memory allocation performance
+- `libnghttp2` for DNS-over-HTTPS (DoH) support
 
 The following C11 features are used in BIND 9: