Index: sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/inc/template-tags.php
===================================================================
--- sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/inc/template-tags.php	(revision 3656)
+++ sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/inc/template-tags.php	(working copy)
@@ -131,7 +131,10 @@
 		function wporg_developer_user_note( $comment, $args, $depth ) {
 			$GLOBALS['comment'] = $comment;
 			$count = (int) DevHub_User_Contributed_Notes_Voting::count_votes( $comment->comment_ID, 'difference' );
+			$curr_user_note = DevHub_User_Contributed_Notes_Voting::is_current_user_note( $comment->comment_ID );
 			$comment_class = ( -1 > $count ) ? 'bad-note' : '';
+			$comment_class .= $curr_user_note ? ' user-submitted-vote' : '';
+			$comment_class = trim( $comment_class );
 			?>
 
 			<li id="comment-<?php comment_ID(); ?>" <?php comment_class( $comment_class ); ?>>
Index: sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/inc/user-content-voting.php
===================================================================
--- sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/inc/user-content-voting.php	(revision 3656)
+++ sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/inc/user-content-voting.php	(working copy)
@@ -194,12 +194,43 @@
 		// Comment, if provided, must be approved.
 		if ( $comment_id ) {
 			$can = ( '1' == get_comment( $comment_id )->comment_approved );
+			// Users can't vote on their own comments.
+			if ( $can && self::is_current_user_note( $comment_id ) ) {
+				$can = false;
+			}
 		}
 
 		return apply_filters( 'devhub_user_can_vote', $can, $user_id, $comment_id );
 	}
 
 	/**
+	 * Determines if a note was submitted by the current user.
+	 *
+	 * @param int     $comment_id The comment ID, or empty to use current comment.
+	 * @return bool True if the note was submitted by the current user.
+	 */
+	public static function is_current_user_note( $comment_id = '' ) {
+
+		if ( ! $comment_id ) {
+			global $comment;
+			$comment_id = $comment->comment_ID;
+		}
+
+		$note    = get_comment( $comment_id );
+		$user_id = get_current_user_id();
+
+		if ( ! $note || ! $user_id ) {
+			return false;
+		}
+
+		if ( (int) $note->user_id === $user_id ) {
+			return true;
+		}
+
+		return false;
+	}
+
+	/**
 	 * Has user upvoted the comment?
 	 *
 	 * @access public
@@ -263,6 +294,7 @@
 		}
 
 		$can_vote     = self::user_can_vote( get_current_user_id(), $comment_id );
+		$user_note    = self::is_current_user_note( $comment_id );
 		$logged_in    = is_user_logged_in();
 		$comment_link = get_comment_link( $comment_id );
 		$nonce        = wp_create_nonce( 'user-note-vote-' . $comment_id );
@@ -270,6 +302,10 @@
 		$log_in_str   = __( 'You must log in to vote on the helpfulness of this note', 'wporg' );
 		$log_in_url   = add_query_arg( 'redirect_to', urlencode( $comment_link ), 'https://login.wordpress.org' );
 
+		if ( !$can_vote && $user_note ) {
+			$disabled_str = __( 'Voting for your own note is disabled', 'wporg' );
+		}
+
 		echo '<div class="user-note-voting" data-nonce="' . esc_attr( $nonce ) . '">';
 
 		// Up vote link
Index: sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/scss/main.scss
===================================================================
--- sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/scss/main.scss	(revision 3656)
+++ sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/scss/main.scss	(working copy)
@@ -1478,6 +1478,9 @@
 	.user-voted.user-note-voting-down .dashicons {
 		color: red;
 	}
+	.user-submitted-vote .dashicons {
+		color: grey;
+	}
 
 	.syntaxhighlighter {
 		/* These are !important due to use of !important in SyntaxHighlighter Evolved plugin. */
Index: sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/stylesheets/main.css
===================================================================
--- sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/stylesheets/main.css	(revision 3656)
+++ sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/stylesheets/main.css	(working copy)
@@ -1568,6 +1568,9 @@
 .devhub-wrap .user-voted.user-note-voting-down .dashicons {
   color: red;
 }
+.devhub-wrap .user-submitted-vote .dashicons {
+  color: grey;
+}
 .devhub-wrap .syntaxhighlighter {
   /* These are !important due to use of !important in SyntaxHighlighter Evolved plugin. */
   max-width: 100% !important;