Document new utils.

doc/utils.md

@@ -231,7 +231,17 @@ process output.
 
 ### Keyword Arguments
 
-TODO
+    (import util-kwargs)
+
+A simple module providing convenient syntax for defining procedures
+with keyword arguments with default values.
+
+    (define-kwproc (name arg ... (#:kw binding [default]) ...) body ...)
+
+Defines new procedure ```name``` with positional arguments ```arg
+...``` and optional keyword arguments with implicit default value
+```#f``` or any specific value given in the keyword argument
+specification.
 
 ### List
 
@@ -449,7 +459,27 @@ Returns true if the sets contain exactly the same values.
 
 ### Stdout
 
-TODO
+    (import util-stdout)
+
+Very simple module wrapping standard output.
+
+    (*stdout-quiet* [quiet])
+
+A boolean parameter which disables all output from procedures in this
+module if its value is ```#t```.
+
+    (stdout-print . args)
+
+If not quiet, passes ```args``` to ```print```.
+
+    (stdout-printf fmt . args)
+
+If not quiet, prints formatted string ```fmt``` by applying ```args```
+to ```format``` procedure.
+
+    (stdout-newline)
+
+If not quiet, calls ```(newline)```.
 
 ### String