diff --git a/bellman/src/groth16/generator.rs b/bellman/src/groth16/generator.rs
index f3f3d3a..50d5bd7 100644
--- a/bellman/src/groth16/generator.rs
+++ b/bellman/src/groth16/generator.rs
@@ -425,7 +425,7 @@ pub fn generate_parameters<E, C>(
         &worker
     );
 
-    // Evaluate for auxillary variables.
+    // Evaluate for auxiliary variables.
     eval(
         &g1_wnaf,
         &g2_wnaf,
diff --git a/bellman/src/groth16/mod.rs b/bellman/src/groth16/mod.rs
index 620f32e..e613d66 100644
--- a/bellman/src/groth16/mod.rs
+++ b/bellman/src/groth16/mod.rs
@@ -221,7 +221,7 @@ pub struct Parameters<E: Engine> {
     pub h: Arc<Vec<E::G1Affine>>,
 
     // Elements of the form (beta * u_i(tau) + alpha v_i(tau) + w_i(tau)) / delta
-    // for all auxillary inputs. Variables can never be unconstrained, so this
+    // for all auxiliary inputs. Variables can never be unconstrained, so this
     // never contains points at infinity.
     pub l: Arc<Vec<E::G1Affine>>,
 
diff --git a/bellman/src/lib.rs b/bellman/src/lib.rs
index ffbb25b..d22d90f 100644
--- a/bellman/src/lib.rs
+++ b/bellman/src/lib.rs
@@ -60,7 +60,7 @@ impl Variable {
 }
 
 /// Represents the index of either an input variable or
-/// auxillary variable.
+/// auxiliary variable.
 #[derive(Copy, Clone, PartialEq, Debug)]
 pub enum Index {
     Input(usize),
@@ -190,7 +190,7 @@ pub enum SynthesisError {
     IoError(io::Error),
     /// During verification, our verifying key was malformed.
     MalformedVerifyingKey,
-    /// During CRS generation, we observed an unconstrained auxillary variable
+    /// During CRS generation, we observed an unconstrained auxiliary variable
     UnconstrainedVariable
 }
 
@@ -210,7 +210,7 @@ impl Error for SynthesisError {
             SynthesisError::UnexpectedIdentity => "encountered an identity element in the CRS",
             SynthesisError::IoError(_) => "encountered an I/O error",
             SynthesisError::MalformedVerifyingKey => "malformed verifying key",
-            SynthesisError::UnconstrainedVariable => "auxillary variable was unconstrained"
+            SynthesisError::UnconstrainedVariable => "auxiliary variable was unconstrained"
         }
     }
 }