diff --git a/nova/src/nonnative/mod.rs b/nova/src/nonnative/mod.rs
index ff67366111..e694bc7d35 100644
--- a/nova/src/nonnative/mod.rs
+++ b/nova/src/nonnative/mod.rs
@@ -1,3 +1,5 @@
+//! This module implements various low-level gadgets, which is copy from Nova non-public mod
+//! https://github.com/microsoft/Nova/blob/main/src/gadgets/mod.rs#L3
 //! This module implements various gadgets necessary for doing non-native arithmetic
 //! Code in this module is adapted from [bellman-bignat](https://github.com/alex-ozdemir/bellman-bignat), which is licenced under MIT
 
@@ -5,34 +7,34 @@ use bellperson::SynthesisError;
 use ff::PrimeField;
 
 trait OptionExt<T> {
-  fn grab(&self) -> Result<&T, SynthesisError>;
-  fn grab_mut(&mut self) -> Result<&mut T, SynthesisError>;
+    fn grab(&self) -> Result<&T, SynthesisError>;
+    fn grab_mut(&mut self) -> Result<&mut T, SynthesisError>;
 }
 
 impl<T> OptionExt<T> for Option<T> {
-  fn grab(&self) -> Result<&T, SynthesisError> {
-    self.as_ref().ok_or(SynthesisError::AssignmentMissing)
-  }
-  fn grab_mut(&mut self) -> Result<&mut T, SynthesisError> {
-    self.as_mut().ok_or(SynthesisError::AssignmentMissing)
-  }
+    fn grab(&self) -> Result<&T, SynthesisError> {
+        self.as_ref().ok_or(SynthesisError::AssignmentMissing)
+    }
+    fn grab_mut(&mut self) -> Result<&mut T, SynthesisError> {
+        self.as_mut().ok_or(SynthesisError::AssignmentMissing)
+    }
 }
 
 trait BitAccess {
-  fn get_bit(&self, i: usize) -> Option<bool>;
+    fn get_bit(&self, i: usize) -> Option<bool>;
 }
 
 impl<Scalar: PrimeField> BitAccess for Scalar {
-  fn get_bit(&self, i: usize) -> Option<bool> {
-    if i as u32 >= Scalar::NUM_BITS {
-      return None;
-    }
+    fn get_bit(&self, i: usize) -> Option<bool> {
+        if i as u32 >= Scalar::NUM_BITS {
+            return None;
+        }
 
-    let (byte_pos, bit_pos) = (i / 8, i % 8);
-    let byte = self.to_repr().as_ref()[byte_pos];
-    let bit = byte >> bit_pos & 1;
-    Some(bit == 1)
-  }
+        let (byte_pos, bit_pos) = (i / 8, i % 8);
+        let byte = self.to_repr().as_ref()[byte_pos];
+        let bit = byte >> bit_pos & 1;
+        Some(bit == 1)
+    }
 }
 
 pub mod bignat;
diff --git a/nova/src/utils.rs b/nova/src/utils.rs
index 7ad0344802..c9ea14f6fd 100644
--- a/nova/src/utils.rs
+++ b/nova/src/utils.rs
@@ -1,5 +1,5 @@
-//! This module implements various low-level gadgets, which is copy from Nova non-public mod
-//! https://github.com/microsoft/Nova/blob/main/src/gadgets/mod.rs#L3
+//! This module implements various util function, which is copy from Nova non-public mod
+//! https://github.com/microsoft/Nova/blob/main/src/gadgets/mod.rs#L5
 use std::collections::BTreeMap;
 
 #[allow(dead_code)]