Specify working options in readme.

README.md

@@ -75,8 +75,59 @@ If you installed rsstube another way (manual download, package manager), update
 
 `rsstube <link>`
 
-There are some options, but most of them don't work yet.
+Here are the options that work right now.
 
+### Informational
+	-h, --help			Print help text and exit.
+
+	--license			Print license declaration and exit.
+
+	--sites				Print list of supported sites and exit.
+
+	--version			Print version and exit.
+
+### General Options
+	-n, --non-network               (Offline mode.) Only return feed URL if
+					it can be determined without downloading
+					any pages.
+
+	-o, --output FILENAME           Output results to FILENAME rather than
+					console. (If FILENAME is an empty
+					string, rsstube will output to the
+					console.)
+
+	--output-format [ompl|url]      Specify which output format to use.
+					[Default: url]
+
+	--unbreak			Attempt to work with hostile websites
+					(e.g., those that use Cloudflare).
+
+	-U, --update			Update rsstube (only works if
+					downloaded with git).
+
+### Verbosity
+	--verbosity [0-4]		Specify how much output you want.
+					Higher number means more messages.
+					[Default: 3]
+					| MESSAGE TYPE | REQUIRED VERBOSITY |
+					| ------------ | ------------------ |
+					|     Debug    |         4          |
+					|     Notify   |         3          |
+					|     Warn     |         2          |
+					|     Error    |         1          |
+
+	-v, --verbose			Show: all. Same as --verbosity 4.
+
+	-q, --quiet			Show: Error. Suppress: Warn, Notify,
+					Debug. Same as --verbosity 1.
+
+	--suppress-errors		Suppress: all. Same as --verbosity 0.
+
+### Networking (PycURL args)
+	-A, --user-agent UA_STRING	Specify custom user-agent string.
+
+	-H, --header HEADER		Add a header. Use it multiple times to
+					add multiple headers.
 
 ## Scope