diff --git a/aqt/browser.py b/aqt/browser.py
index d23abc576..7d1b594cc 100644
--- a/aqt/browser.py
+++ b/aqt/browser.py
@@ -314,6 +314,7 @@ class DataModel(QAbstractTableModel):
 ######################################################################
 
 COLOUR_SUSPENDED = "#FFFFB2"
+COLOUR_MARKED = "#ccc"
 
 flagColours = {
     1: "#F5B7B1",
@@ -345,7 +346,8 @@ class StatusDelegate(QItemDelegate):
             col = COLOUR_SUSPENDED
         elif c.userFlag() > 0:
             col = flagColours[c.userFlag()]
-
+        elif c.note().hasTag("Marked"):
+            col = COLOUR_MARKED
         if col:
             brush = QBrush(QColor(col))
             painter.save()
@@ -408,6 +410,7 @@ class Browser(QMainWindow):
         f.actionAdd_Tags.triggered.connect(lambda: self.addTags())
         f.actionRemove_Tags.triggered.connect(lambda: self.deleteTags())
         f.actionClear_Unused_Tags.triggered.connect(self.clearUnusedTags)
+        f.actionToggle_Mark.triggered.connect(lambda: self.onMark())
         f.actionChangeModel.triggered.connect(self.onChangeModel)
         f.actionFindDuplicates.triggered.connect(self.onFindDupes)
         f.actionFindReplace.triggered.connect(self.onFindReplace)
@@ -1464,13 +1467,24 @@ update cards set usn=?, mod=?, did=? where id in """ + scids,
         self.model.reset()
         self.mw.requireReset()
 
-    # Flags
+    # Flags & Marking
     ######################################################################
 
     def onSetFlag(self, n):
         self.col.setUserFlag(n, self.selectedCards())
         self.model.reset()
 
+    def onMark(self, mark=None):
+        if mark is None:
+            mark = not self.isMarked()
+        if mark:
+            self.addTags(tags="marked", label=False)
+        else:
+            self.deleteTags(tags="marked", label=False)
+
+    def isMarked(self):
+        return not not (self.card and self.card.note().hasTag("Marked"))
+
     # Repositioning
     ######################################################################
 
diff --git a/aqt/reviewer.py b/aqt/reviewer.py
index 452da6972..2a6003a05 100644
--- a/aqt/reviewer.py
+++ b/aqt/reviewer.py
@@ -120,6 +120,7 @@ class Reviewer:
     def revHtml(self):
         extra = self.mw.col.conf.get("reviewExtra", "")
         return f"""
+<div id=_mark>&#x2605;</div>
 <div id=_flag>&#x2691;</div>
 <div id=qa></div>
 {extra}
@@ -171,6 +172,7 @@ The front of this card is empty. Please run Tools>Empty Cards.""")
 
         self.web.eval("_showQuestion(%s,'%s');" % (json.dumps(q), bodyclass))
         self._drawFlag()
+        self._drawMark()
         self._showAnswerButton()
         # if we have a type answer field, focus main web
         if self.typeCorrect:
@@ -190,6 +192,10 @@ The front of this card is empty. Please run Tools>Empty Cards.""")
     def _drawFlag(self):
         self.web.eval("_drawFlag(%s);" % self.card.userFlag())
 
+    def _drawMark(self):
+        self.web.eval("_drawMark(%s);" % json.dumps(
+                        self.card.note().hasTag("marked")))
+
     # Showing the answer
     ##########################################################################
 
@@ -243,6 +249,7 @@ The front of this card is empty. Please run Tools>Empty Cards.""")
             ("Ctrl+3", lambda: self.setFlag(3)),
             ("Ctrl+4", lambda: self.setFlag(4)),
             ("Ctrl+0", lambda: self.setFlag(0)),
+            ("*", self.onMark),
             ("=", self.onBuryNote),
             ("-", self.onBuryCard),
             ("!", self.onSuspend),
@@ -574,6 +581,7 @@ time = %(time)d;
                 [_("Blue Flag"), "Ctrl+4", lambda: self.setFlag(4)],
                 [_("No Flag"), "Ctrl+5", lambda: self.setFlag(0)],
             ]],
+            [_("Mark Note"), "*", self.onMark],
             [_("Bury Card"), "-", self.onBuryCard],
             [_("Bury Note"), "=", self.onBuryNote],
             [_("Suspend Card"), "@", self.onSuspendCard],
@@ -616,6 +624,15 @@ time = %(time)d;
         self.card.flush()
         self._drawFlag()
 
+    def onMark(self):
+        f = self.card.note()
+        if f.hasTag("marked"):
+            f.delTag("marked")
+        else:
+            f.addTag("marked")
+        f.flush()
+        self._drawMark()
+
     def onSuspend(self):
         self.mw.checkpoint(_("Suspend"))
         self.mw.col.sched.suspendCards(
diff --git a/designer/browser.ui b/designer/browser.ui
index c85c37288..38713fcc6 100644
--- a/designer/browser.ui
+++ b/designer/browser.ui
@@ -294,6 +294,7 @@
     <addaction name="actionAdd_Tags"/>
     <addaction name="actionRemove_Tags"/>
     <addaction name="actionClear_Unused_Tags"/>
+    <addaction name="actionToggle_Mark"/>
     <addaction name="separator"/>
     <addaction name="actionChangeModel"/>
     <addaction name="separator"/>
@@ -569,6 +570,14 @@
     <string>Manage Note Types...</string>
    </property>
   </action>
+  <action name="actionToggle_Mark">
+   <property name="text">
+    <string>Toggle Mark</string>
+   </property>
+   <property name="shortcut">
+    <string>Ctrl+K</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="icons.qrc"/>
diff --git a/web/reviewer.css b/web/reviewer.css
index 44967cbaf..59c2f8561 100644
--- a/web/reviewer.css
+++ b/web/reviewer.css
@@ -14,10 +14,23 @@ img {
 
 #_flag {
     position: fixed;
-    right: 7px;
+    right: 10px;
     top: 0;
     font-size: 30px;
     display: none;
+    -webkit-text-stroke-width: 1px;
+    -webkit-text-stroke-color: black;
+}
+
+#_mark {
+    position: fixed;
+    left: 10px;
+    top: 0;
+    font-size: 30px;
+    color: yellow;
+    display: none;
+    -webkit-text-stroke-width: 1px;
+    -webkit-text-stroke-color: black;
 }
 
 #typeans {
diff --git a/web/reviewer.js b/web/reviewer.js
index 5b195c134..ef2b21e24 100644
--- a/web/reviewer.js
+++ b/web/reviewer.js
@@ -76,6 +76,15 @@ function _drawFlag(flag) {
     elem.css("color", _flagColours[flag]);
 }
 
+function _drawMark(mark) {
+    var elem = $("#_mark");
+    if (!mark) {
+        elem.hide();
+    } else {
+        elem.show();
+    }
+}
+
 function _typeAnsPress() {
     if (window.event.keyCode === 13) {
         pycmd("ans");