diff --git a/markdown/extensions/abbr.py b/markdown/extensions/abbr.py
index ab7c3743..9e10259b 100644
--- a/markdown/extensions/abbr.py
+++ b/markdown/extensions/abbr.py
@@ -6,7 +6,7 @@
 # See https://Python-Markdown.github.io/extensions/abbreviations
 # for documentation.
 
-# Original code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com/)
+# Original code Copyright 2007-2008 [Waylan Limberg](https://github.com/waylan)
 # and [Seemant Kulleen](http://www.kulleen.org/)
 
 # All changes Copyright 2008-2014 The Python Markdown Project
diff --git a/markdown/extensions/attr_list.py b/markdown/extensions/attr_list.py
index 3bbcaee1..52ac38a6 100644
--- a/markdown/extensions/attr_list.py
+++ b/markdown/extensions/attr_list.py
@@ -8,7 +8,7 @@
 # See https://Python-Markdown.github.io/extensions/attr_list
 # for documentation.
 
-# Original code Copyright 2011 [Waylan Limberg](http://achinghead.com/).
+# Original code Copyright 2011 [Waylan Limberg](https://github.com/waylan).
 
 # All changes Copyright 2011-2014 The Python Markdown Project
 
diff --git a/markdown/extensions/codehilite.py b/markdown/extensions/codehilite.py
index 92e7d8f2..be45a3f1 100644
--- a/markdown/extensions/codehilite.py
+++ b/markdown/extensions/codehilite.py
@@ -6,7 +6,7 @@
 # See https://Python-Markdown.github.io/extensions/code_hilite
 # for documentation.
 
-# Original code Copyright 2006-2008 [Waylan Limberg](http://achinghead.com/).
+# Original code Copyright 2006-2008 [Waylan Limberg](https://github.com/waylan).
 
 # All changes Copyright 2008-2014 The Python Markdown Project
 
diff --git a/markdown/extensions/def_list.py b/markdown/extensions/def_list.py
index 5324bf19..f09abe37 100644
--- a/markdown/extensions/def_list.py
+++ b/markdown/extensions/def_list.py
@@ -6,7 +6,7 @@
 # See https://Python-Markdown.github.io/extensions/definition_lists
 # for documentation.
 
-# Original code Copyright 2008 [Waylan Limberg](http://achinghead.com)
+# Original code Copyright 2008 [Waylan Limberg](https://github.com/waylan)
 
 # All changes Copyright 2008-2014 The Python Markdown Project
 
diff --git a/markdown/extensions/fenced_code.py b/markdown/extensions/fenced_code.py
index bae7330a..709e9238 100644
--- a/markdown/extensions/fenced_code.py
+++ b/markdown/extensions/fenced_code.py
@@ -6,7 +6,7 @@
 # See https://Python-Markdown.github.io/extensions/fenced_code_blocks
 # for documentation.
 
-# Original code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com/).
+# Original code Copyright 2007-2008 [Waylan Limberg](https://github.com/waylan).
 
 # All changes Copyright 2008-2014 The Python Markdown Project
 
diff --git a/markdown/extensions/meta.py b/markdown/extensions/meta.py
index cb703399..9976b8de 100644
--- a/markdown/extensions/meta.py
+++ b/markdown/extensions/meta.py
@@ -6,7 +6,7 @@
 # See https://Python-Markdown.github.io/extensions/meta_data
 # for documentation.
 
-# Original code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com).
+# Original code Copyright 2007-2008 [Waylan Limberg](https://github.com/waylan).
 
 # All changes Copyright 2008-2014 The Python Markdown Project
 
diff --git a/markdown/extensions/sane_lists.py b/markdown/extensions/sane_lists.py
index be421f94..5e05459f 100644
--- a/markdown/extensions/sane_lists.py
+++ b/markdown/extensions/sane_lists.py
@@ -6,7 +6,7 @@
 # See https://Python-Markdown.github.io/extensions/sane_lists
 # for documentation.
 
-# Original code Copyright 2011 [Waylan Limberg](http://achinghead.com)
+# Original code Copyright 2011 [Waylan Limberg](https://github.com/waylan)
 
 # All changes Copyright 2011-2014 The Python Markdown Project
 
diff --git a/markdown/extensions/tables.py b/markdown/extensions/tables.py
index f405e35c..678048e6 100644
--- a/markdown/extensions/tables.py
+++ b/markdown/extensions/tables.py
@@ -6,7 +6,7 @@
 # See https://Python-Markdown.github.io/extensions/tables
 # for documentation.
 
-# Original code Copyright 2009 [Waylan Limberg](http://achinghead.com)
+# Original code Copyright 2009 [Waylan Limberg](https://github.com/waylan)
 
 # All changes Copyright 2008-2014 The Python Markdown Project
 
diff --git a/markdown/extensions/wikilinks.py b/markdown/extensions/wikilinks.py
index 3f3cbe2d..bb72c3d8 100644
--- a/markdown/extensions/wikilinks.py
+++ b/markdown/extensions/wikilinks.py
@@ -6,7 +6,7 @@
 # See https://Python-Markdown.github.io/extensions/wikilinks
 # for documentation.
 
-# Original code Copyright [Waylan Limberg](http://achinghead.com/).
+# Original code Copyright [Waylan Limberg](https://github.com/waylan).
 
 # All changes Copyright The Python Markdown Project