diff --git a/katas/content/single_qubit_gates/prepare_arbitrary_state/index.md b/katas/content/single_qubit_gates/prepare_arbitrary_state/index.md
index e0ef5ea196..714c5683d8 100644
--- a/katas/content/single_qubit_gates/prepare_arbitrary_state/index.md
+++ b/katas/content/single_qubit_gates/prepare_arbitrary_state/index.md
@@ -1,6 +1,6 @@
 **Inputs:**
 
-1. A non-negative real number $\alpha$.
+1. A real number $\alpha$.
 2. A non-negative real number $\beta = \sqrt{1 - \alpha^2}$.
 3. A real number $\theta$.
 4. A qubit in state $\ket{0}$.