diff --git a/src/net/sourceforge/plantuml/acearth/package-info.java b/src/net/sourceforge/plantuml/acearth/package-info.java
index ff8536d87..26683cf61 100644
--- a/src/net/sourceforge/plantuml/acearth/package-info.java
+++ b/src/net/sourceforge/plantuml/acearth/package-info.java
@@ -3,6 +3,6 @@
  * <a href="https://plantuml.com/xearth" target="_top">
  * XEarth Image</a>.
  *
- * @see ext.plantuml.com.ctreber.acearth
+ * @see zext.plantuml.com.ctreber.acearth
  */
 package net.sourceforge.plantuml.acearth;
diff --git a/src/net/sourceforge/plantuml/acearth/readme.md b/src/net/sourceforge/plantuml/acearth/readme.md
index a369bb7a5..e5d8f1c1a 100644
--- a/src/net/sourceforge/plantuml/acearth/readme.md
+++ b/src/net/sourceforge/plantuml/acearth/readme.md
@@ -3,7 +3,7 @@
 ## Description
 This package provides classes used to generate [XEarth Image](https://plantuml.com/xearth).
 
-The Java port of `XEarth` used in `PlantUML` is the [`AC.earth` of Christian Treber](../../../../ext/plantuml/com/ctreber/acearth/).
+The Java port of `XEarth` used in `PlantUML` is the [`AC.earth` of Christian Treber](../../../../zext/plantuml/com/ctreber/acearth/).
 
 ## Link
 - [XEarth Image _(on `PlantUML`)_](https://plantuml.com/xearth)
@@ -13,7 +13,7 @@ The Java port of `XEarth` used in `PlantUML` is the [`AC.earth` of Christian Tre
 - [`xearth` for Windows of Greg Hewgill](https://hewgill.com/xearth/)
 
 ## Credit
-- [`AC.earth` of Christian Treber](../../../../ext/plantuml/com/ctreber/acearth/)
+- [`AC.earth` of Christian Treber](../../../../zext/plantuml/com/ctreber/acearth/)
 - [AC Earth _(on Web Archive)_](https://web.archive.org/web/20180428011447/http://www.acproductions.de/acearth)
 
 ## Misc.
diff --git a/src/net/sourceforge/plantuml/flashcode/package-info.java b/src/net/sourceforge/plantuml/flashcode/package-info.java
index e016dc1c9..1d995313b 100644
--- a/src/net/sourceforge/plantuml/flashcode/package-info.java
+++ b/src/net/sourceforge/plantuml/flashcode/package-info.java
@@ -2,7 +2,7 @@
  * Provides classes used to manage 
  * Flashcode especially QR Code (on PlantUML).
  *
- * @see ext.plantuml.com.google.zxing
+ * @see zext.plantuml.com.google.zxing
  * @see net.sourceforge.plantuml.klimt.creole.atom.AtomImg#createQrcode
  */
 package net.sourceforge.plantuml.flashcode;
diff --git a/src/net/sourceforge/plantuml/flashcode/readme.md b/src/net/sourceforge/plantuml/flashcode/readme.md
index 5d49c3123..eac30f0ae 100644
--- a/src/net/sourceforge/plantuml/flashcode/readme.md
+++ b/src/net/sourceforge/plantuml/flashcode/readme.md
@@ -8,7 +8,7 @@ This package provides classes used to manage Flashcode especially QR Code (on Pl
 - [QR code _(on Wikipedia)_](https://en.wikipedia.org/wiki/QR_code)
 
 ## Credit
-- [`com.google.zxing`](../../../../ext/plantuml/com/google/zxing/) _(included in PlantUML)_
+- [`com.google.zxing`](../../../../zext/plantuml/com/google/zxing/) _(included in PlantUML)_
 - :octocat: [zxing/zxing](https://github.com/zxing/zxing)
 
 ## Misc.
diff --git a/src/zext/plantuml/com/ctreber/acearth/package-info.java b/src/zext/plantuml/com/ctreber/acearth/package-info.java
index b0da411ce..89c59c62e 100644
--- a/src/zext/plantuml/com/ctreber/acearth/package-info.java
+++ b/src/zext/plantuml/com/ctreber/acearth/package-info.java
@@ -9,7 +9,7 @@
  * Internal copy of <code>AC.earth</code> - <code>XEarth</code> 
  * for Java <i>(code of Christian Treber)</i>.
  * 
- * @see ext.plantuml.com.ctreber.acearth.ACearth
+ * @see zext.plantuml.com.ctreber.acearth.ACearth
  * @see net.sourceforge.plantuml.acearth
  * 
  */
diff --git a/src/zext/plantuml/com/ctreber/acearth/scanbit/ScanBit.java b/src/zext/plantuml/com/ctreber/acearth/scanbit/ScanBit.java
index 13367fe0f..e101629ec 100644
--- a/src/zext/plantuml/com/ctreber/acearth/scanbit/ScanBit.java
+++ b/src/zext/plantuml/com/ctreber/acearth/scanbit/ScanBit.java
@@ -53,7 +53,7 @@ public class ScanBit implements Comparable
 
   /**
    * <p>See values for
-   * @see ext.plantuml.com.ctreber.acearth.util.Polygon
+   * @see zext.plantuml.com.ctreber.acearth.util.Polygon
    */
   public int getType()
   {