diff --git a/core/java/android/widget/Toolbar.java b/core/java/android/widget/Toolbar.java
index f211b32b0f1fa..ece8aa45398c9 100644
--- a/core/java/android/widget/Toolbar.java
+++ b/core/java/android/widget/Toolbar.java
@@ -679,6 +679,8 @@ public class Toolbar extends ViewGroup {
      * as screen readers or tooltips.
      *
      * @return The navigation button's content description
+     *
+     * @attr ref android.R.styleable#Toolbar_navigationContentDescription
      */
     @Nullable
     public CharSequence getNavigationContentDescription() {
@@ -692,6 +694,8 @@ public class Toolbar extends ViewGroup {
      *
      * @param resId Resource ID of a content description string to set, or 0 to
      *              clear the description
+     *
+     * @attr ref android.R.styleable#Toolbar_navigationContentDescription
      */
     public void setNavigationContentDescription(int resId) {
         setNavigationContentDescription(resId != 0 ? getContext().getText(resId) : null);
@@ -704,6 +708,8 @@ public class Toolbar extends ViewGroup {
      *
      * @param description Content description to set, or <code>null</code> to
      *                    clear the content description
+     *
+     * @attr ref android.R.styleable#Toolbar_navigationContentDescription
      */
     public void setNavigationContentDescription(@Nullable CharSequence description) {
         if (!TextUtils.isEmpty(description)) {
@@ -725,6 +731,8 @@ public class Toolbar extends ViewGroup {
      * tooltips.</p>
      *
      * @param resId Resource ID of a drawable to set
+     *
+     * @attr ref android.R.styleable#Toolbar_navigationIcon
      */
     public void setNavigationIcon(int resId) {
         setNavigationIcon(getContext().getDrawable(resId));
@@ -741,6 +749,8 @@ public class Toolbar extends ViewGroup {
      * tooltips.</p>
      *
      * @param icon Drawable to set, may be null to clear the icon
+     *
+     * @attr ref android.R.styleable#Toolbar_navigationIcon
      */
     public void setNavigationIcon(@Nullable Drawable icon) {
         if (icon != null) {
@@ -761,6 +771,8 @@ public class Toolbar extends ViewGroup {
      * Return the current drawable used as the navigation icon.
      *
      * @return The navigation icon drawable
+     *
+     * @attr ref android.R.styleable#Toolbar_navigationIcon
      */
     @Nullable
     public Drawable getNavigationIcon() {
diff --git a/core/res/res/values/attrs.xml b/core/res/res/values/attrs.xml
index 9edcca2feb033..a798d2e78a871 100644
--- a/core/res/res/values/attrs.xml
+++ b/core/res/res/values/attrs.xml
@@ -7318,8 +7318,12 @@
         <!-- Reference to a theme that should be used to inflate popups
              shown by widgets in the toolbar. -->
         <attr name="popupTheme" format="reference" />
+        <!-- Icon drawable to use for the navigation button located at
+             the start of the toolbar. -->
         <attr name="navigationIcon" format="reference" />
-        <attr name="navigationContentDescription" format="string|reference" />
+        <!-- Text to set as the content description for the navigation button
+             located at the start of the toolbar. -->
+        <attr name="navigationContentDescription" format="string" />
     </declare-styleable>
 
     <declare-styleable name="Toolbar_LayoutParams">