diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index 532b928..dbb058a 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -272,7 +272,8 @@
               is-image-diff="[[isImageDiff]]"
               base-image="[[_baseImage]]"
               revision-image="[[_revisionImage]]"
-              parent-index="[[_parentIndex]]">
+              parent-index="[[_parentIndex]]"
+              line-of-interest="[[lineOfInterest]]">
             <table
                 id="diffTable"
                 class$="[[_diffTableClass]]"
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
index 75ed70c..06a2a27 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
@@ -95,6 +95,16 @@
         value: DiffViewMode.SIDE_BY_SIDE,
         observer: '_viewModeObserver',
       },
+
+      /**
+       * Special line number which should not be collapsed into a shared region.
+       * @type {{
+       *  number: number,
+       *  leftSide: {boolean}
+       * }|null}
+       */
+      lineOfInterest: Object,
+
       _loggedIn: {
         type: Boolean,
         value: false,