diff --git a/Copyright.txt b/Copyright.txt
index 8cc3bb56..f0d35035 100644
--- a/Copyright.txt
+++ b/Copyright.txt
@@ -1,5 +1,5 @@
 // Copyright.txt
-This computer source code is Copyright ©2017 MindView LLC.
+This computer source code is Copyright ©2020 MindView LLC.
 All Rights Reserved.
 
 Permission to use, copy, modify, and distribute this
diff --git a/lowlevel/NotAtomic.java b/lowlevel/NotAtomic.java
index f77eb128..e3fa4784 100644
--- a/lowlevel/NotAtomic.java
+++ b/lowlevel/NotAtomic.java
@@ -18,8 +18,7 @@ public class NotAtomic {
   public NotAtomic();
     Code:
        0: aload_0
-       1: invokespecial #1 // Method
-java/lang/Object."<init>":()V
+       1: invokespecial #1 // Method java/lang/Object."<init>":()V
        4: return
 
   void f1();
diff --git a/patterns/SingletonPattern.java b/patterns/SingletonPattern.java
index f2e46e30..0e466a76 100644
--- a/patterns/SingletonPattern.java
+++ b/patterns/SingletonPattern.java
@@ -8,8 +8,8 @@ interface Resource {
   void setValue(int x);
 }
 
-// Since this isn't inherited from a Cloneable
-// base class and cloneability isn't added,
+// This isn't inherited from a Cloneable
+// base class and cloneability isn't added so
 // making it final prevents cloneability from
 // being added through inheritance. This also
 // implements thread-safe lazy initialization:
diff --git a/staticchecking/NoBasePetSpeak.py b/staticchecking/NoBasePetSpeak.py
index e148614d..80c771c5 100644
--- a/staticchecking/NoBasePetSpeak.py
+++ b/staticchecking/NoBasePetSpeak.py
@@ -2,7 +2,7 @@
 # (c)2017 MindView LLC: see Copyright.txt
 # We make no guarantees that this code is fit for any purpose.
 # Visit http://OnJava8.com for more book information.
-# Speaking pets without base classes
+#- Speaking pets without base classes
 
 class Cat:
     def speak(self):
diff --git a/staticchecking/PetSpeak.py b/staticchecking/PetSpeak.py
index 57a05bd6..998a678e 100644
--- a/staticchecking/PetSpeak.py
+++ b/staticchecking/PetSpeak.py
@@ -2,7 +2,7 @@
 # (c)2017 MindView LLC: see Copyright.txt
 # We make no guarantees that this code is fit for any purpose.
 # Visit http://OnJava8.com for more book information.
-# Speaking pets in Python
+#- Speaking pets in Python
 
 class Pet:
     def speak(self): pass
diff --git a/validating/tests/StringInverterTests.java b/validating/tests/StringInverterTests.java
index 14251217..81725373 100644
--- a/validating/tests/StringInverterTests.java
+++ b/validating/tests/StringInverterTests.java
@@ -22,7 +22,7 @@ public class StringInverterTests {
   }
   @Test
   void basicInversion2() {
-    expectThrows(Error.class, () -> {
+    assertThrows(Error.class, () -> {
       assertEquals(inverter.invert("X"), "X");
     });
   }
@@ -52,7 +52,7 @@ public class StringInverterTests {
   void lengthNoGreaterThan30() {
     String str = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
     assertTrue(str.length() > 30);
-    expectThrows(RuntimeException.class, () -> {
+    assertThrows(RuntimeException.class, () -> {
       inverter.invert(str);
     });
   }