diff --git a/metadata/rules/README.md b/metadata/rules/README.md
index b0207bb1..2a722651 100644
--- a/metadata/rules/README.md
+++ b/metadata/rules/README.md
@@ -945,6 +945,9 @@ Direct annotations to these terms require a value in the Annotation Extension fi
  * 'GO:0005515 protein binding' 
  * 'GO:0005488 binding'
 
+For more information, see the [binding guidelines](http://wiki.geneontology.org/index.php/Binding_Guidelines)
+on the GO wiki.
+
 <a name="gorule0000053"/>
 
 ## 'NOT' annotation should not have extension
diff --git a/metadata/rules/gorule-0000051.md b/metadata/rules/gorule-0000051.md
index 39af22a2..ad11be70 100644
--- a/metadata/rules/gorule-0000051.md
+++ b/metadata/rules/gorule-0000051.md
@@ -13,3 +13,6 @@ Direct annotations to these terms require a value in the Annotation Extension fi
  * 'GO:0008283 cell population proliferation' 
  * 'GO:0005515 protein binding' 
  * 'GO:0005488 binding'
+
+For more information, see the [binding guidelines](http://wiki.geneontology.org/index.php/Binding_Guidelines)
+on the GO wiki.