Document running a single unittest

Makefile

@@ -15,6 +15,9 @@
 # make BUILD=debug => makes debug build of the library
 #
 # make unittest => builds all unittests (for debug AND release) and runs them
+# make std/somemodule.test => only builds and unittests std.somemodule
+# make std/somepackage.test => only builds and unittests modules in std.somepackage
+# make unittest/std/somemodule.run => run std.somemodule unittest
 #
 # make BUILD=debug unittest => builds all unittests (for debug) and runs them
 #
@@ -25,8 +28,6 @@
 #
 # make install => copies library to /usr/lib
 #
-# make std/somemodule.test => only builds and unittests std.somemodule
-#
 ################################################################################
 # Configurable stuff, usually from the command line
 #