diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6326a2d6..276ff44b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,7 +15,7 @@ Changelog
 
 ### Fixed
 
-* Exception messages of comparisons between `DateTime(Immutalbe)` objects now display their date & time.
+* Exception messages of comparisons between `DateTime(Immutable)` objects now display their date & time.
 * Custom Exception messages for `Assert::count()` now use the values to render the exception message.
 
 ## 1.7.0 (2020-02-14)
@@ -43,7 +43,7 @@ Changelog
 They are countable, without implementing the `Countable` interface.
 * The doc block of `range` now has the proper variables.
 * An empty array will now pass `isList` and `isMap`. As it is a valid form of both.
-If a non empty variant is needed, use `isNonEmptyList` or `isNonEmptyMap`.
+If a non-empty variant is needed, use `isNonEmptyList` or `isNonEmptyMap`.
 
 ### Changed
 
@@ -66,7 +66,7 @@ If you don't use psalm, then this has no impact.
 
 ### Fixed
 
-* `Assert::endsWith()` would not give the correct result when dealing with multibyte suffix.
+* `Assert::endsWith()` would not give the correct result when dealing with a multibyte suffix.
 * `Assert::length(), minLength, maxLength, lengthBetween` would not give the correct result when dealing with multibyte characters.
 
 **NOTE**: These 2 changes may break your assertions if you relied on the fact that multibyte characters didn't behave correctly.
diff --git a/README.md b/README.md
index e316d538..1407a9a1 100644
--- a/README.md
+++ b/README.md
@@ -104,10 +104,10 @@ Method                                                   | Description
 `isIterable($value, $message = '')`                      | Check that a value is an array or a `\Traversable`
 `isCountable($value, $message = '')`                     | Check that a value is an array or a `\Countable`
 `isInstanceOf($value, $class, $message = '')`            | Check that a value is an `instanceof` a class
-`isInstanceOfAny($value, array $classes, $message = '')` | Check that a value is an `instanceof` a at least one class on the array of classes
+`isInstanceOfAny($value, array $classes, $message = '')` | Check that a value is an `instanceof` at least one class on the array of classes
 `notInstanceOf($value, $class, $message = '')`           | Check that a value is not an `instanceof` a class
 `isAOf($value, $class, $message = '')`                   | Check that a value is of the class or has one of its parents
-`isAnyOf($value, array $classes, $message = '')`         | Check that a value a at least one of the class or has one of its parents
+`isAnyOf($value, array $classes, $message = '')`         | Check that a value is of at least one of the classes or has one of its parents
 `isNotA($value, $class, $message = '')`                  | Check that a value is not of the class or has not one of its parents
 `isArrayAccessible($value, $message = '')`               | Check that a value can be accessed as an array
 `uniqueValues($values, $message = '')`                   | Check that the given array contains unique values
@@ -143,7 +143,7 @@ any of the following assertions.
 Method                                              | Description
 --------------------------------------------------- | -----------------------------------------------------------------
 `contains($value, $subString, $message = '')`       | Check that a string contains a substring
-`notContains($value, $subString, $message = '')`    | Check that a string does not contains a substring
+`notContains($value, $subString, $message = '')`    | Check that a string does not contain a substring
 `startsWith($value, $prefix, $message = '')`        | Check that a string has a prefix
 `notStartsWith($value, $prefix, $message = '')`     | Check that a string does not have a prefix
 `startsWithLetter($value, $message = '')`           | Check that a string starts with a letter
diff --git a/tests/AssertTest.php b/tests/AssertTest.php
index a5ade77c..c1f708b9 100644
--- a/tests/AssertTest.php
+++ b/tests/AssertTest.php
@@ -718,7 +718,7 @@ public function testConvertValuesToStrings($method, $args, $exceptionMessage)
         call_user_func_array(array('Webmozart\Assert\Assert', $method), $args);
     }
 
-    public function testAnUnkownMethodThrowsABadMethodCall()
+    public function testAnUnknownMethodThrowsABadMethodCall()
     {
         $this->setExpectedException('\BadMethodCallException');