diff --git a/theme/boost/templates/flat_navigation.mustache b/theme/boost/templates/flat_navigation.mustache
index e1aab0208f9..88d133836ad 100644
--- a/theme/boost/templates/flat_navigation.mustache
+++ b/theme/boost/templates/flat_navigation.mustache
@@ -62,7 +62,7 @@
 <nav class="list-group m-t-1">
     {{/showdivider}}
     {{#action}}
-    <a class="list-group-item list-group-item-action {{#isactive}}font-weight-bold{{/isactive}}" href="{{{action}}}" data-key="{{key}}">
+    <a class="list-group-item list-group-item-action {{#isactive}}font-weight-bold{{/isactive}}" href="{{{action}}}" data-key="{{key}}" data-isexpandable="{{isexpandable}}" data-indent="{{get_indent}}" data-showdivider="{{showdivider}}" data-type="{{type}}" data-nodetype="{{nodetype}}" data-collapse="{{collapse}}" data-forceopen="{{forceopen}}" data-isactive="{{isactive}}" data-hidden="{{hidden}}" data-preceedwithhr="{{preceedwithhr}}" {{#parent.key}}data-parent-key="{{.}}"{{/parent.key}}>
         <div class="m-l-{{get_indent}}">
             {{#is_section}}
                 <div class="media">
@@ -79,7 +79,7 @@
     </a>
     {{/action}}
     {{^action}}
-    <div class="list-group-item" data-key="{{key}}">
+    <div class="list-group-item" data-key="{{key}}" data-isexpandable="{{isexpandable}}" data-indent="{{get_indent}}" data-showdivider="{{showdivider}}" data-type="{{type}}" data-nodetype="{{nodetype}}" data-collapse="{{collapse}}" data-forceopen="{{forceopen}}" data-isactive="{{isactive}}" data-hidden="{{hidden}}" data-preceedwithhr="{{preceedwithhr}}" {{#parent.key}}data-parent-key="{{.}}"{{/parent.key}}>
         <div class="m-l-{{get_indent}}">
             {{#is_section}}
                 {{#pix}}i/folder{{/pix}}
diff --git a/theme/upgrade.txt b/theme/upgrade.txt
index 1c526f0c8a2..ecf77f07892 100644
--- a/theme/upgrade.txt
+++ b/theme/upgrade.txt
@@ -7,6 +7,8 @@ information provided here is intended especially for theme designer.
   and a template with the same name in /theme/boost/templates/ rendering the pagelayout "login".
   To prevent misunderstanding when overriding one of these templates in a Boost child theme,
   the first one was renamed to loginform.mustache - see MDL-58970.
+* The Boost flat navigation nodes now have several data-attributes which let plugin developers
+  access properties from the underlying navigation nodes in the browser - see MDL-59425.
 
 === 3.3 ===