Update README

1 files changed, 6 insertions, 1 deletions

diff --git a/README.md b/README.md
index 8c273ec..86db32b 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,8 @@ games are supported. You can do things like:
 * `number K dice`: rolls the dice and keeps the `number` highest results. For
   example, `1K2d20` is the "rolling with advantage" mechanic from 5th Edition
   Dungeons and Dragons (roll two d20's, keep the highest).
+* `number k dice`: like `K` but keeps the `number` lowest results. `1k2d20` is
+  D&D5E's "disadvantage" mechanic.
 
 ### Full syntax and semantics
 
@@ -82,6 +84,7 @@ The parser recognizes the following grammar:
           | '-' Die
           | Die 'E' Die
           | Die 'K' Die
+          | Die 'k' Die
 
 Semantics are defined in terms of the `pool` function.
 
@@ -109,11 +112,13 @@ Semantics are defined in terms of the `pool` function.
   dice pool generated by `E` is rolled, and the resulting dice pool is composed
   of those dice that rolled highest, taking up to as many dice as the result of
   rolling `D`.
+* `DkE` is the "keep lowest" mechanic. Like `K`, but selects the lowest rolling
+  dice.
 
 Additionally:
 
 * The binary arithmetic operations (` + `, ` - `) are left associative.
-* The die operations (`d`, `E`, `K`) are right associative (`1d2d3` is
+* The die operations (`d`, `E`, `K`, `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`
   is equivalent to `(1d6) + (1d4)`).