diff --git a/README.md b/README.md
index 257425b..0ef9fc3 100644
--- a/README.md
+++ b/README.md
@@ -464,8 +464,9 @@ Many thanks to the following individuals (in alphabetical order):
 * **Greenway, Ian**
 	* For testing the flag behavior of the `ccf/scf` instructions on real hardware. <sup>[10](#r10), [21](#r21)</sup>
 * **Harston, Jonathan Graham**
-	1. For his technical documents about the Zilog Z80. <sup>[22](#r22), [23](#r23), [24](#r24)</sup>
-	2. For porting the _"Z80 Instruction Set Exerciser"_ to the ZX Spectrum. <sup>[25](#r25)</sup>
+	1. For his research work.
+	2. For his technical documents about the Zilog Z80. <sup>[22](#r22), [23](#r23), [24](#r24)</sup>
+	3. For porting the _"Z80 Instruction Set Exerciser"_ to the ZX Spectrum. <sup>[25](#r25)</sup>
 * **Helcmanovsky, Peter (Ped7g)**
 	1. For helping me to write the _"IN-MEMPTR"_ test.
 	2. For writing the _"Z80 Block Flags Test"_. <sup>[26](#r26), [27](#r27)</sup>
@@ -564,7 +565,7 @@ Many thanks to the following individuals (in alphabetical order):
 	* https://mdfs.net/Docs/Comp/Z80/OpCodeMap
 23. <span id="r23">Harston, Jonathan Graham (1997-12-18). _"Z80 Microprocessor Undocumented Instructions"_.</span>
 	* https://mdfs.net/Docs/Comp/Z80/UnDocOps
-24. <span id="r24">Harston, Jonathan Graham (1998-04-15). _"Full Z80 Opcode List Including Undocumented Opcodes"_.</span>
+24. <span id="r24">Harston, Jonathan Graham (1998-04-15). _"Full Z80 Opcode List Including Undocumented Opcodes"_ v0.11.</span>
 	* https://mdfs.net/Docs/Comp/Z80/OpList
 25. <span id="r25">https://mdfs.net/Software/Z80/Exerciser/Spectrum</span>
 26. <span id="r26">https://spectrumcomputing.co.uk/forums/viewtopic.php?t=6102</span>
diff --git a/THANKS b/THANKS
index 19352f1..2f68c68 100644
--- a/THANKS
+++ b/THANKS
@@ -48,8 +48,9 @@ Many thanks to the following individuals (in alphabetical order):
     For testing the flag behavior of the "ccf/scf" instructions on real hardware
     [10,21].
 * Harston, Jonathan Graham
-    1. For his technical documents about the Zilog Z80 [22,23,24].
-    2. For porting the "Z80 Instruction Set Exerciser" to the ZX Spectrum [25].
+    1. For his research work.
+    2. For his technical documents about the Zilog Z80 [22,23,24].
+    3. For porting the "Z80 Instruction Set Exerciser" to the ZX Spectrum [25].
 * Helcmanovsky, Peter (Ped7g)
     1. For helping me to write the "IN-MEMPTR" test.
     2. For writing the "Z80 Block Flags Test" [26,27].
@@ -157,7 +158,7 @@ References
     Instructions".
     * https://mdfs.net/Docs/Comp/Z80/UnDocOps
 24. Harston, Jonathan Graham (1998-04-15). "Full Z80 Opcode List Including
-    Undocumented Opcodes".
+    Undocumented Opcodes" v0.11.
     * https://mdfs.net/Docs/Comp/Z80/OpList
 25. https://mdfs.net/Software/Z80/Exerciser/Spectrum
 26. https://spectrumcomputing.co.uk/forums/viewtopic.php?t=6102
diff --git a/documentation/Thanks.rst b/documentation/Thanks.rst
index dfa4f4f..6b17ce9 100644
--- a/documentation/Thanks.rst
+++ b/documentation/Thanks.rst
@@ -107,8 +107,9 @@ Many thanks to the following individuals (in alphabetical order):
 
 * **Harston, Jonathan Graham**
 
-  1. For his technical documents about the Zilog Z80. |re| |fe| :ref:`22<r22>`, :ref:`23<r23>`, :ref:`24<r24>` |ren| |ces|
-  2. For porting the *"Z80 Instruction Set Exerciser"* to the ZX Spectrum. |re| |fe| :ref:`25<r25>` |ren| |ces|
+  1. For his research work.
+  2. For his technical documents about the Zilog Z80. |re| |fe| :ref:`22<r22>`, :ref:`23<r23>`, :ref:`24<r24>` |ren| |ces|
+  3. For porting the *"Z80 Instruction Set Exerciser"* to the ZX Spectrum. |re| |fe| :ref:`25<r25>` |ren| |ces|
 
 * **Helcmanovsky, Peter (Ped7g)**
 
@@ -379,7 +380,7 @@ References
 
     .. _r24:
 
-    Harston, Jonathan Graham (1998-04-15). *"Full Z80 Opcode List Including Undocumented Opcodes"*.
+    Harston, Jonathan Graham (1998-04-15). *"Full Z80 Opcode List Including Undocumented Opcodes"* v0.11.
 
     * https://mdfs.net/Docs/Comp/Z80/OpList