mention arrays of arrays and slices of slices
Fixes #113.
R=gri, rsc
CC=golang-dev
https://golang.org/cl/159049
diff --git a/doc/go_spec.html b/doc/go_spec.html
index 5eaeea0..8a24746 100644
--- a/doc/go_spec.html
+++ b/doc/go_spec.html
@@ -607,12 +607,16 @@
using the built-in function <code>len(a)</code>, which is a
compile-time constant. The elements can be indexed by integer
indices 0 through the <code>len(a)-1</code> (ยง<a href="#Indexes">Indexes</a>).
+Array types are always one-dimensional but may be composed to form
+multi-dimensional types.
</p>
<pre>
[32]byte
[2*N] struct { x, y int32 }
[1000]*float64
+[3][5]int
+[2][2][2]float64 // same as [2]([2]([2]float64))
</pre>
<h3 id="Slice_types">Slice types</h3>
@@ -690,6 +694,13 @@
new([100]int)[0:50]
</pre>
+<p>
+Like arrays, slices are always one-dimensional but may be composed to construct
+higher-dimensional objects.
+With arrays of arrays, the inner arrays are, by construction, always the same length;
+however with slices of slices (or arrays of slices), the lengths may vary dynamically.
+Moreover, the inner slices must be allocated individually (with <code>make</code>).
+</p>
<h3 id="Struct_types">Struct types</h3>
