diff --git a/README.md b/README.md
index 4c960c3..7050b15 100644
--- a/README.md
+++ b/README.md
@@ -113,7 +113,7 @@ In no particular order, features that have been implemented and are planned:
 - [ ] Matchers
     - [X] Equality matchers - `eq`, `be`, `be_a`, `match`
     - [X] Truthy matchers - `be_true`, `be_false`, `be_truthy`, `be_falsey`
-    - [ ] Comparison matchers - `<`, `<=`, `>`, `>=`, `be_within`
+    - [X] Comparison matchers - `<`, `<=`, `>`, `>=`, `be_within`
     - [ ] Question matchers - `be_nil`, `be_xxx`
     - [ ] Exception matchers - `raise_error`
     - [ ] Collection matchers - `start_with`, `end_with`, `contain`, `contain_exactly`