README.md: add a line about context and dependencies

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This work was sponsored by WIO (wiowireless.com)

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 # ucert
 
-ucert is a signature-chaining wrapper around usign using libubox blob and blobmsg. 
+ucert is a signature-chaining wrapper around usign using blob and blobmsg.
+It's meant to be used for OpenWrt routers and uses libubox for most things, to allow dumping certificates in JSON format libjson-c and libblobmsg-json are used as well.
 
 ## a few words about security
 ucert inherits all its cryptographic properties from the underlying usign implementation which as such wasn't meant to be used in such a way.