Describe exploding dice

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@@ -77,6 +77,7 @@ ignored):
           | Die '+' Die
           | Die '-' Die
           | '-' Die
+          | Die 'E' Die
 
 Semantics are defined in terms of the `pool` function.
 
@@ -92,6 +93,12 @@ Semantics are defined in terms of the `pool` function.
   `D`.
 * `-D` returns the opposites of values generated by `D`.
 * `D-E` is equivalent to `D+(-E)`.
+* `DEF` (here `E` is the literal symbol `E`, `D` and `F` are dice expressions)
+  is an "exploding die." First `D` is rolled.  Now each die in the dice pool
+  generated by `F` is rolled repeatedly until it rolls something less than the
+  value rolled on `D`. The die's result is the sum of all those rolls. *Note:*
+  this could lead to an infinite evaluation if `F` always rolls higher than a
+  possible result of `D`.
 
 Additionally: