diff --git a/README.md b/README.md
index a1e5732..b5f8c24 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Kalker (or "kalk") is a calculator program/website that supports user-defined va
 ## Features
 
 * Operators: +, -, \*, /, !
-* Groups: (), ⌈⌉, ⌋⌊
+* Groups: (), ⌈⌉, ⌊⌋, []
 * [Pre-defined functions and constants](https://github.com/PaddiM8/kalker/blob/master/kalk/src/prelude.rs)
 * User-defined functions and variables. `f(x, y) = xy`, `x = 5`
 * Derivative of functions (derivatives of noisy functions or of higher order can be a bit inaccurate). `f'(2)`, `sin'(-pi)`
diff --git a/cli/help.txt b/cli/help.txt
index c88a509..237693e 100644
--- a/cli/help.txt
+++ b/cli/help.txt
@@ -1,6 +1,6 @@
 Overview of features
     Operators: +, -, *, /, !, %
-    Groups: (), ⌈⌉, ⌋⌊
+    Groups: (), ⌈⌉, ⌊⌋, []
     Pre-defined functions and constants
     User-defined functions and variables
     User-defined units (experimental and limited)
diff --git a/kalk/README.md b/kalk/README.md
index 8c1ff91..7ff4e4a 100644
--- a/kalk/README.md
+++ b/kalk/README.md
@@ -10,7 +10,7 @@ f(a, 2)
 
 ## Features
 * Operators: +, -, \*, /, !
-* Groups: (), ⌈⌉, ⌋⌊
+* Groups: (), ⌈⌉, ⌊⌋, []
 * [Pre-defined functions and constants](https://github.com/PaddiM8/kalk/blob/master/kalk/src/prelude.rs)
 * User-defined functions and variables. `f(x, y) = xy`, `x = 5`
 * Understands fairly ambiguous syntax. Eg. `2sin50 + 2xy`