Update README

1 files changed, 8 insertions, 6 deletions

diff --git a/README.md b/README.md
index 16ec451..8c273ec 100644
--- a/README.md
+++ b/README.md
@@ -70,15 +70,15 @@ games are supported. You can do things like:
 **Note:** this is still an early version. Syntax and semantics will be expanded
 in future versions. *Backwards incompatible changes are possible.*
 
-The parser recognizes the following grammar (all whitespace between symbols is
-ignored):
+The parser recognizes the following grammar:
 
     Die ::= <an integer>
           | '(' Die ')'
           | Die 'd' Die
           | 'd' Die
+          | Die ' + ' Die
+          | Die ' - ' Die
           | Die '+' Die
-          | Die '-' Die
           | '-' Die
           | Die 'E' Die
           | Die 'K' Die
@@ -93,10 +93,12 @@ Semantics are defined in terms of the `pool` function.
   numbers, each between 1 and `roll(E)`. *Note:* if `D` or `E` evaluates to a
   negative number, the behavior is undefined.
 * `dD` is equivalent to `1dD`.
-* `D+E` appends the dice pool generated by `E` to the dice pool generated by
+* `D + E` appends the dice pool generated by `E` to the dice pool generated by
   `D`.
 * `-D` returns the opposites of values generated by `D`.
-* `D-E` is equivalent to `D+(-E)`.
+* `D - E` is equivalent to `D + (-E)`.
+* `D+E` is the additive bonus operation. For each die in `D`'s pool, the die is
+  rolled and `roll(E)` is added to its result.
 * `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
@@ -110,7 +112,7 @@ Semantics are defined in terms of the `pool` function.
 
 Additionally:
 
-* The binary arithmetic operations (`+`, `-`) are left associative.
+* The binary arithmetic operations (` + `, ` - `) are left associative.
 * The die operations (`d`, `E`, `K`) are right associative (`1d2d3` is
   equivalent to `1d(2d3)`, use explicit parentheses if you need `(1d2)d3`).
 * Die operations bind stronger than the binary arithmetic operations (`1d6+1d4`