diff --git a/src/plonk/circuit_builder.rs b/src/plonk/circuit_builder.rs
index e6020ad8..4879d144 100644
--- a/src/plonk/circuit_builder.rs
+++ b/src/plonk/circuit_builder.rs
@@ -87,7 +87,7 @@ pub struct CircuitBuilder<F: RichField + Extendable<D>, const D: usize> {
     // of switches
     pub(crate) current_switch_gates: Vec<Option<(SwitchGate<F, D>, usize, usize)>>,
 
-    // The `U32ArithmeticGate` currently being filled (so new u32 arithmetic operations will be added to this gate before creating a new one)
+    /// The `U32ArithmeticGate` currently being filled (so new u32 arithmetic operations will be added to this gate before creating a new one)
     pub(crate) current_u32_arithmetic_gate: Option<(usize, usize)>,
 
     /// An available `ConstantGate` instance, if any.