diff --git a/config_defaults_inc.php b/config_defaults_inc.php
index 6dc188dd6a..5a33d384fd 100644
--- a/config_defaults_inc.php
+++ b/config_defaults_inc.php
@@ -3789,8 +3789,7 @@
* Show issue relationships using graphs.
*
* In order to use this feature, you must first install GraphViz.
- *
- * Graphviz homepage: http://www.research.att.com/sw/tools/graphviz/
+ * @see https://www.graphviz.org/ Graphviz homepage
*
* Refer to the notes near the top of core/graphviz_api.php and
* core/relationship_graph_api.php for more information.
diff --git a/core/graphviz_api.php b/core/graphviz_api.php
index 44b6aa52d2..76aff5f4ae 100644
--- a/core/graphviz_api.php
+++ b/core/graphviz_api.php
@@ -22,10 +22,8 @@
* enough just to support relationship_graph_api.php. They don't
* support subgraphs yet.
*
- * The original Graphviz package is available at:
- * - http://www.graphviz.org/
- * Additional documentation can be found at:
- * - http://www.graphviz.org/Documentation.html
+ * The original Graphviz package including documentation is available at:
+ * - https://www.graphviz.org/
*
* @package CoreAPI
* @subpackage GraphVizAPI
diff --git a/core/relationship_graph_api.php b/core/relationship_graph_api.php
index f0509ac0e8..f23b578553 100644
--- a/core/relationship_graph_api.php
+++ b/core/relationship_graph_api.php
@@ -20,9 +20,7 @@
* This uses GraphViz utilities to generate relationship graphs for
* issues. GraphViz must be installed in order to use this feature.
*
- * Graphviz is available at:
- * - http://www.graphviz.org/
- * - http://www.research.att.com/sw/tools/graphviz/
+ * Graphviz is available at: https://www.graphviz.org/
*
* Most Linux distributions already have a GraphViz package
* conveniently available for download and install. Refer to
diff --git a/docbook/Admin_Guide/en-US/config/relationship.xml b/docbook/Admin_Guide/en-US/config/relationship.xml
index 6652f98541..f26ae12ff9 100644
--- a/docbook/Admin_Guide/en-US/config/relationship.xml
+++ b/docbook/Admin_Guide/en-US/config/relationship.xml
@@ -14,13 +14,13 @@
nodes and relationships as links between such nodes. Possible values are ON or OFF.
Default is OFF.
-
-
- This feature requires installing GraphViz
- (all OSes except Windows) or WinGraphviz (only Windows).
- Refer to the notes near the top of core/graphviz_api.php and
- core/relationship_graph_api.php for more information.
-
+
+ This feature requires installing the
+ GraphViz library.
+ Refer to the notes near the top of core/graphviz_api.php
+ and core/relationship_graph_api.php for more information.
+
+