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+Builtin syntaxes
+================
+
+This implementation includes minimal number of builtin syntaxes. All other
+constructs should be defined as user defined syntaxes in Lisp itself.
+
+In following examples, lines starting with ``>`` represent characters
+provided to input stream. Lines without starting ``>`` character represent
+evaluation results written to output stream.
+
+Available builtin syntaxes are:
+
+    * `lambda`
+
+        Definition of new user defined function.
+
+        Examples::
+
+            > ((lambda x x) 1 2 3)
+            (1 2 3)
+
+            > ((lambda (x) x) 1)
+            1
+
+            > ((lambda (x . y) y) 1 2 3)
+            (2 3)
+
+    * `syntax`
+
+        Definition of new user defined syntax.
+
+        Examples::
+
+            > ((syntax x x) (lambda x x) 1 2 3)
+            (1 2 3)
+
+    * `define`
+
+        Add new symbol binding to current context.
+
+        Examples::
+
+            > (define xyz 42)
+            > xyz
+            42
+
+    * `set!`
+
+        Change previously defined context entry.
+
+        Examples::
+
+            > (define xyz 42)
+            > xyz
+            42
+            > (set! xyz 24)
+            > xyz
+            24
+
+    * `begin`
+
+        Evaluate multiple expressions and return result of last expression
+        evaluation.
+
+        Examples::
+
+            > (begin 1 2 3)
+            3
+
+    * `quote`
+
+        Evaluates to provided argument.
+
+        Examples::
+
+            > (quote (1 2 3))
+            (1 2 3)
+
+            > '(3 2 1)
+            (3 2 1)
+
+    * `if`
+
+        If first argument evaluates to `thruthy` value, `if` syntax returns
+        result of second argument evaluation. If first argument evaluates to
+        `falsy` value, result of third argument evaluation is returned or
+        ``()`` if third argument is not available.
+
+        `Falsy` values are ``0``, ``()``, ``""`` and empty symbol.
+
+        `Thruthy` values are all that are not `falsy`.
+
+        Examples::
+
+            > (if 0 1 2)
+            2
+
+            > (if "0" 1 2)
+            1
+
+
+Source code
+-----------
+
+syntax.h
+''''''''
+
+.. literalinclude:: ../src_c/syntax.h
+    :language: c
+
+
+syntax.c
+''''''''
+
+.. literalinclude:: ../src_c/syntax.c
+    :language: c