diff --git a/errata.html b/errata.html
index 16db811..f759710 100644
--- a/errata.html
+++ b/errata.html
@@ -19,7 +19,7 @@ pre {
   <h1>Errata</h1>
   <p>
     <b>p.xiii, ¶1</b>: delete "Object Oberon".
-    (Thanks to Luca Boasso, 2016-02-15.)
+    (Thanks to Luca Boasso, 2016-02-15.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -52,7 +52,7 @@ pre {
     <!-- The "unnamed" restriction is there for basic types, which
          are named, so it forbids Celsius(0)==float64(0), for instance.
      -->
-    (Thanks to Carlos Romero Brox, 2015-12-19.)
+    (Thanks to Carlos Romero Brox, 2015-12-19.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -69,7 +69,7 @@ pre {
     <b>p.48</b>: <code>f.ReadByte()</code> serves as an
     example of a reference to <code>f</code>, but <code>*os.File</code> has no such
     method.  For "<code>ReadByte</code>", read "<code>Stat</code>", four times.
-    (Thanks to Peter Olsen, 2016-01-06.)
+    (Thanks to Peter Olsen, 2016-01-06.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -80,14 +80,14 @@ pre {
   <p>
     <b>p.52, ¶9</b>: For "The integer arithmetic operators", read
     "The arithmetic operators".
-    (Thanks to Yoshiki Shibata, 2015-12-20.)
+    (Thanks to Yoshiki Shibata, 2015-12-20.  Corrected in the fourth printing.)
   </p>
 
   <p>
     <b>p.57, ¶4</b>: To "any comparison with NaN always yields false",
     add "(except <code>!=</code>, which is always the negation of
     <code>==</code>)".
-    (Thanks to Luca Boasso, 2016-02-15.)
+    (Thanks to Luca Boasso, 2016-02-15.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -105,7 +105,7 @@ pre {
 
   <p>
     <b>p.73, ¶1</b>: For "a exercise", read "an exercise".
-    (Thanks to vrajmohan, 2015-12-28.)
+    (Thanks to vrajmohan, 2015-12-28.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -116,7 +116,7 @@ pre {
 
   <p>
     <b>p.75, ¶4</b>: For "<code>%u</code>", read "%<code>o</code>".
-    (Thanks to William Hannish, 2015-12-21.)
+    (Thanks to William Hannish, 2015-12-21.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -138,26 +138,27 @@ pre {
   <p>
     <b>p.84, ¶2</b>: For "used as function parameters",
     read "used as function parameters or results".
-    (Thanks to Yang Yang 杨玚, 2016-04-18.)
+    (Thanks to Yang Yang 杨玚, 2016-04-18.  Corrected in the fourth printing.)
   </p>
 
   <p>
     <b>p.107, ¶6</b>: in "JSON's <code>\U</code><i>hhhh</i> numeric escapes",
     the <code>U</code> should be lowercase: <code>\u</code><i>hhhh</i>.
-    (Thanks to Kohei Marumoto (丸本耕平), 2016-09-23.)
+    (Thanks to Kohei Marumoto (丸本耕平), 2016-09-23.  Corrected in the fourth printing.)
   </p>
  
   <p>
     <b>p.112</b>: Exercise 4.11 calls for a "CRUD" (create, read, update,
     delete) tool for GitHub Issues.  Since GitHub does not currently allow
     Issues to be deleted, for "delete", read "close".
-    (Thanks to Yoshiki Shibata, 2016-01-18.)
+    (Thanks to Yoshiki Shibata, 2016-01-18.  Corrected in the fourth printing.)
   </p>
 
   <p>
     <b>p.115</b>: The anchor element in
     <code>gopl.io/ch4/issueshtml</code>'s template is missing a closing
-    <code>&lt;/a&gt;</code> tag.  (Thanks to Taj Khattra, 2016-01-19.)
+    <code>&lt;/a&gt;</code> tag.
+    (Thanks to Taj Khattra, 2016-01-19.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -169,13 +170,13 @@ pre {
 
   <p>
     <b>p.139, ¶4</b>: For "in Chapter 3", read "in Chapter 4".
-    (Thanks to Yoshiki Shibata, 2016-07-03.)
+    (Thanks to Yoshiki Shibata, 2016-07-03.  Corrected in the fourth printing.)
   </p>
 
   <p>
     <b>p.160, ¶4</b>: For <code>Get("item"))</code>,
     read <code>Get("item")</code>.
-    (Thanks to Yoshiki Shibata, 2016-02-01.)
+    (Thanks to Yoshiki Shibata, 2016-02-01.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -185,7 +186,7 @@ pre {
 
   <p>
     <b>p.177, ¶6</b>: For "as we saw", read "as we will see".
-    (Thanks to David Drysdale, 2016-07-05.)
+    (Thanks to David Drysdale, 2016-07-05.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -199,24 +200,24 @@ pre {
     <b>p.222, Exercise 8.1</b>: The port numbers for <code>London</code>
     and <code>Tokyo</code> should be swapped in the final command to
     match the earlier commands.
-    (Thanks to Kiyoshi Kamishima, 2016-01-08.)
+    (Thanks to Kiyoshi Kamishima, 2016-01-08.  Corrected in the fourth printing.)
   </p>
 
   <p>
     <b>p.235, ¶3</b>: <code>makeThumbnails</code> refers to the second draft
     of the function, <code>makeThumbnails2</code>.
-    (Thanks to 有賀功 Isao Aruga, 2016-07-13.)
+    (Thanks to 有賀功 Isao Aruga, 2016-07-13.  Corrected in the fourth printing.)
   </p>
  
   <p>
     <b>p.272, ¶3</b>: for "the request body", read "the response body".
-    (Thanks to 曹春晖, 2016-01-19.)
+    (Thanks to 曹春晖, 2016-01-19.  Corrected in the fourth printing.)
   </p>
 
   <p>
     <b>p.288, code display following ¶4</b>: In the import declaration, for
     <code>"database/mysql"</code>, read <code>"database/sql"</code>.
-    (Thanks to Jose Colon Rodriguez, 2016-01-09.)
+    (Thanks to Jose Colon Rodriguez, 2016-01-09.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -227,20 +228,20 @@ pre {
 
     It should read:
     <pre>{"+x * -x", Env{"x": 2}, "-4"}</pre>
-    (Thanks to Shinji Dosaka, 2016-07-15.)
+    (Thanks to Shinji Dosaka, 2016-07-15.  Corrected in the fourth printing.)
   </p>
 
   <p>
     <b>p.341, Exercise 12.7</b>: For "decoder" and
     "<code>json.Decoder</code>", read "encoder" and
     "<code>json.Encoder</code>", respectively.
-    (Thanks to Yoshiki Shibata, 2016-08-27.)
+    (Thanks to Yoshiki Shibata, 2016-08-27.  Corrected in the fourth printing.)
   </p>
 
   <p>
     <b>p.347, Exercise 12.8</b>: For "like <code>json.Marshal</code>",
     read "like <code>json.Unmarshal</code>".
-    (Thanks to chai2010, 2016-01-01.)
+    (Thanks to chai2010, 2016-01-01.  Corrected in the fourth printing.)
   </p>
 
   <p>
@@ -260,7 +261,7 @@ pre {
 
   <p>
     <b>p.366, Exercise 13.3</b>: For <code>bzip2.writer</code>, read <code>bzip.writer</code>.
-    (Thanks to Yoshiki Shibata, 2016-09-05.)
+    (Thanks to Yoshiki Shibata, 2016-09-05.  Corrected in the fourth printing.)
   </p>
 
 </body>