diff --git a/CHANGELOG.md b/CHANGELOG.md
index fe3cfa2..6e6e7ff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## v0.20.4
+
+* Improved error messaging with `@override` when feature is missing
+* Fixed source code typos
+
 ## v0.20.3
 
 * Fixed bug [#202](https://github.com/final-hill/decorator-contracts/issues/202)
diff --git a/package-lock.json b/package-lock.json
index 9680687..202a27c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
     "name": "@final-hill/decorator-contracts",
-    "version": "0.20.3",
+    "version": "0.20.4",
     "lockfileVersion": 2,
     "requires": true,
     "packages": {
diff --git a/package.json b/package.json
index e31a466..910ad5b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@final-hill/decorator-contracts",
-    "version": "0.20.3",
+    "version": "0.20.4",
     "description": "Code Contracts for TypeScript and ECMAScript classes",
     "main": "dist/index.js",
     "types": "dist/index.d.ts",
diff --git a/src/lib/Feature.ts b/src/lib/Feature.ts
index cff0231..bee359f 100644
--- a/src/lib/Feature.ts
+++ b/src/lib/Feature.ts
@@ -9,10 +9,10 @@ import ClassRegistration from './ClassRegistration';
 
 class Feature {
     #descriptor: PropertyDescriptor;
-    #overridenOriginalDescriptor: PropertyDescriptor | undefined;
+    #overriddenOriginalDescriptor: PropertyDescriptor | undefined;
 
     /**
-     * Does the current feature have an @override declaration?
+     * Does the current feature have an `@override` declaration?
      */
     hasOverrides = false;
 
@@ -98,16 +98,16 @@ class Feature {
     /**
      * Returns the original feature descriptor which was replaced by the `override` decorator
      */
-    get overridenOriginalDescriptor(): PropertyDescriptor| undefined {
-        return this.#overridenOriginalDescriptor;
+    get overriddenOriginalDescriptor(): PropertyDescriptor| undefined {
+        return this.#overriddenOriginalDescriptor;
     }
 
     /**
      * Sets the feature descriptor. Used by the `override` decorator.
      * @param {PropertyDescriptor} value - The descriptor to save
      */
-    set overridenOriginalDescriptor(value: PropertyDescriptor | undefined) {
-        this.#overridenOriginalDescriptor = value;
+    set overriddenOriginalDescriptor(value: PropertyDescriptor | undefined) {
+        this.#overriddenOriginalDescriptor = value;
     }
 
     /**
diff --git a/src/override.ts b/src/override.ts
index bd4688f..0e755ae 100644
--- a/src/override.ts
+++ b/src/override.ts
@@ -28,7 +28,7 @@ function override(target: Record<PropertyKey, any>, propertyKey: PropertyKey, de
     const registration = CLASS_REGISTRY.getOrCreate(Class),
         feature = registration.findFeature(propertyKey);
 
-    assert(feature != null, MSG_MISSING_FEATURE);
+    assert(feature != null, `${MSG_MISSING_FEATURE}: ${registration.Class.name}.prototype.${String(propertyKey)}`);
 
     const ancFeature = feature.ancestorFeature;
 
@@ -42,7 +42,7 @@ function override(target: Record<PropertyKey, any>, propertyKey: PropertyKey, de
         assert(thisMethod.length == ancMethod.length, MSG_INVALID_ARG_LENGTH);
     }
 
-    feature.overridenOriginalDescriptor = descriptor;
+    feature.overriddenOriginalDescriptor = descriptor;
 
     // method decorators are evaluated before class decorators
     return {