diff --git a/mock/mock.go b/mock/mock.go
index 1bfac9c..e7daf11 100644
--- a/mock/mock.go
+++ b/mock/mock.go
@@ -398,7 +398,7 @@ func (m *Mock) AssertNumberOfCalls(t TestingT, methodName string, expectedCalls
 }
 
 // AssertCalled asserts that the method was called.
-// It can produce a false result when an argument is a pointer type and the underyling value changed after calling the mocked method.
+// It can produce a false result when an argument is a pointer type and the underlying value changed after calling the mocked method.
 func (m *Mock) AssertCalled(t TestingT, methodName string, arguments ...interface{}) bool {
 	if !assert.True(t, m.methodWasCalled(methodName, arguments), fmt.Sprintf("The \"%s\" method should have been called with %d argument(s), but was not.", methodName, len(arguments))) {
 		t.Logf("%v", m.expectedCalls())
@@ -408,7 +408,7 @@ func (m *Mock) AssertCalled(t TestingT, methodName string, arguments ...interfac
 }
 
 // AssertNotCalled asserts that the method was not called.
-// It can produce a false result when an argument is a pointer type and the underyling value changed after calling the mocked method.
+// It can produce a false result when an argument is a pointer type and the underlying value changed after calling the mocked method.
 func (m *Mock) AssertNotCalled(t TestingT, methodName string, arguments ...interface{}) bool {
 	if !assert.False(t, m.methodWasCalled(methodName, arguments), fmt.Sprintf("The \"%s\" method was called with %d argument(s), but should NOT have been.", methodName, len(arguments))) {
 		t.Logf("%v", m.expectedCalls())