diff --git a/resources/context_help/QgsBookmarks-en_US b/resources/context_help/QgsBookmarks-en_US
index d516a1d..8b89bf2 100644
--- a/resources/context_help/QgsBookmarks-en_US
+++ b/resources/context_help/QgsBookmarks-en_US
@@ -5,6 +5,7 @@ Spatial Bookmarks allow you to "bookmark" a geographic location and return to it
 <a href="#working">Working with Bookmarks</a><br/>
 <a href="#zooming">Zooming to a Bookmark</a><br/>
 <a href="#deleting">Deleting a Bookmark</a><br/>
+<a href="#updating">Updating a Bookmark</a><br/>
 
 <a name="creating">
 <h4>Creating a Bookmark</h4>
@@ -31,4 +32,8 @@ You can also zoom to a bookmark by double-clicking on it.
 <h5>Deleting a Bookmark</h5>
 </a>
 To delete a bookmark from the Bookmarks dialog, click on it then click the <label>Delete</label> button. Confirm your choice by clicking <label>OK</label> or cancel the delete by clicking <label>Cancel</label>.
+<a name="updating">
+<h5>Updating a Bookmark</h5>
+</a>
+To update the extent of a bookmark, click on it then click the <label>Update</label> button. Confirm your choice by clicking <label>OK</label> or cancel the update by clicking <label>Cancel</label>.
 
diff --git a/src/app/qgisapp.cpp b/src/app/qgisapp.cpp
index 93910a6..b5ea879 100644
--- a/src/app/qgisapp.cpp
+++ b/src/app/qgisapp.cpp
@@ -6339,7 +6339,6 @@ void QgisApp::showBookmarks()
   {
     bookmarks = new QgsBookmarks( this, Qt::WindowMinMaxButtonsHint );
   }
-  bookmarks->restorePosition();
   bookmarks->show();
   bookmarks->raise();
   bookmarks->setWindowState( bookmarks->windowState() & ~Qt::WindowMinimized );
diff --git a/src/app/qgsbookmarkitem.cpp b/src/app/qgsbookmarkitem.cpp
index fd6e5ed..3a0165d 100644
--- a/src/app/qgsbookmarkitem.cpp
+++ b/src/app/qgsbookmarkitem.cpp
@@ -43,48 +43,41 @@ void QgsBookmarkItem::store()
   int rc;
   QgsDebugMsg( QString( "Opening user database: %1" ).arg( mUserDbPath ) );
   rc = sqlite3_open( mUserDbPath.toUtf8().data(), &db );
-  if ( rc )
+  if ( SQLITE_OK == rc )
   {
-    QgsDebugMsg( QString( "Can't open database: %1" ).arg( sqlite3_errmsg( db ) ) );
-
-    // XXX This will likely never happen since on open, sqlite creates the
-    //     database if it does not exist.
-    assert( rc == 0 );
-  }
-  // prepare the sql statement
-  const char *pzTail;
-  sqlite3_stmt *ppStmt;
-  QString sql;
-  QTextStream sqlStream( &sql );
-  sqlStream << "insert into tbl_bookmarks values(null,'" <<
-  mName << "','" <<
-  mProjectTitle << "'," <<
-  mViewExtent.xMinimum() << "," <<
-  mViewExtent.yMinimum() << "," <<
-  mViewExtent.xMaximum() << "," <<
-  mViewExtent.yMaximum() << "," <<
-  mSrid << ")";
+    // prepare the sql statement
+    QString sql;
+    QTextStream sqlStream( &sql );
+    // use '17 g' format; SmartNotation is default
+    sqlStream.setRealNumberPrecision( 17 );
+    sqlStream << "insert into tbl_bookmarks values(null,'" <<
+    // fix occurrences of single-quote
+    mName.replace( '\'', "''" ) << "','" <<
+    mProjectTitle.replace( '\'', "''" ) << "'," <<
+    mViewExtent.xMinimum() << "," <<
+    mViewExtent.yMinimum() << "," <<
+    mViewExtent.xMaximum() << "," <<
+    mViewExtent.yMaximum() << "," <<
+    mSrid << ")";
 
-  QgsDebugMsg( QString( "Storing bookmark using: %1" ).arg( sql ) );
+    QgsDebugMsg( QString( "Storing bookmark using: %1" ).arg( sql ) );
 
-  QByteArray sqlData = sql.toUtf8();
-
-  rc = sqlite3_prepare( db, sqlData.constData(), sqlData.size(), &ppStmt, &pzTail );
-  // XXX Need to free memory from the error msg if one is set
-  if ( rc == SQLITE_OK )
-  {
-    // get the first row of the result set
-    if ( sqlite3_step( ppStmt ) != SQLITE_DONE )
+    char * errmsg = 0;
+    rc = sqlite3_exec( db, sql.toUtf8(), NULL, NULL, &errmsg );
+    if ( rc != SQLITE_OK )
     {
-
       // XXX query failed -- warn the user some how
-      QgsDebugMsg( QString( "Failed to store bookmark: %1" ).arg( sqlite3_errmsg( db ) ) );
+      QgsDebugMsg( QString( "Failed to store bookmark: %1" ).arg( errmsg ) );
+      sqlite3_free( errmsg );
     }
-    // close the statement
-    sqlite3_finalize( ppStmt );
-    // close the database
     sqlite3_close( db );
   }
+  else
+  {
+    QgsDebugMsg( QString( "Can't open database: %1" ).arg( sqlite3_errmsg( db ) ) );
 
-
+    // XXX This will likely never happen since on open, sqlite creates the
+    //     database if it does not exist.
+    assert( rc == 0 );
+  }
 }
diff --git a/src/app/qgsbookmarks.cpp b/src/app/qgsbookmarks.cpp
index e93ff83..d1403be 100644
--- a/src/app/qgsbookmarks.cpp
+++ b/src/app/qgsbookmarks.cpp
@@ -38,6 +38,9 @@ QgsBookmarks::QgsBookmarks( QWidget *parent, Qt::WFlags fl )
     mParent( parent )
 {
   setupUi( this );
+
+  restorePosition();
+
   // user database is created at QGIS startup in QgisApp::createDB
   // we just check whether there is our database [MD]
   QFileInfo myFileInfo;
@@ -54,11 +57,15 @@ QgsBookmarks::QgsBookmarks( QWidget *parent, Qt::WFlags fl )
   // Create the zoomto and delete buttons and add them to the
   // toolbar
   //
+  QPushButton * btnUpdate = new QPushButton( tr( "&Update" ) );
   QPushButton * btnDelete = new QPushButton( tr( "&Delete" ) );
   QPushButton * btnZoomTo = new QPushButton( tr( "&Zoom to" ) );
   btnZoomTo->setDefault( true );
+  buttonBox->addButton( btnUpdate, QDialogButtonBox::ActionRole );
   buttonBox->addButton( btnDelete, QDialogButtonBox::ActionRole );
   buttonBox->addButton( btnZoomTo, QDialogButtonBox::ActionRole );
+  // connect the slot up to catch when a bookmark is updated
+  connect( btnUpdate, SIGNAL( clicked() ), this, SLOT( on_btnUpdate_clicked() ) );
   // connect the slot up to catch when a bookmark is deleted
   connect( btnDelete, SIGNAL( clicked() ), this, SLOT( on_btnDelete_clicked() ) );
   // connect the slot up to catch when a bookmark is zoomed to
@@ -109,7 +116,7 @@ void QgsBookmarks::initialise()
         QString xMax = QString::fromUtf8(( const char * )sqlite3_column_text( ppStmt, 5 ) );
         QString yMax = QString::fromUtf8(( const char * )sqlite3_column_text( ppStmt, 6 ) );
         // set the extents
-        item->setText( 2, xMin + ", " + yMin + ", " + xMax + ", " + yMax );
+        item->setText( 2, xMin + ", " + yMin + " : " + xMax + ", " + yMax );   // use colon to separate ll from ur corners listed (be consistent with other displays of extent)
         // set the id
         item->setText( 3, QString::fromUtf8(( const char * )sqlite3_column_text( ppStmt, 0 ) ) );
       }
@@ -145,6 +152,66 @@ void QgsBookmarks::saveWindowLocation()
   settings.setValue( "/Windows/Bookmarks/geometry", saveGeometry() );
 }
 
+void QgsBookmarks::on_btnUpdate_clicked()
+{
+  // get the current item
+  QTreeWidgetItem *item = lstBookmarks->currentItem();
+  if ( item )
+  {
+    // make sure the user really wants to update this bookmark
+    if ( QMessageBox::Ok == QMessageBox::information( this, tr( "Really Update?" ),
+         tr( "Are you sure you want to update the %1 bookmark?" ).arg( item->text( 0 ) ),
+         QMessageBox::Ok | QMessageBox::Cancel ) )
+    {
+      // retrieve the current map extent
+      QgsRectangle viewExtent = QgisApp::instance()->mapCanvas()->extent();
+
+      int rc;
+      QgsDebugMsg( QString( "Opening user database: %1" ).arg( QgsApplication::qgisUserDbFilePath() ) );
+      rc = connectDb();
+      if ( SQLITE_OK == rc )
+      {
+        // prepare the sql statement
+        QString sql;
+        QTextStream sqlStream( &sql );
+        // use '17 g' format; SmartNotation is default
+        sqlStream.setRealNumberPrecision( 17 );
+        sqlStream << "update tbl_bookmarks set " <<
+        "xmin=" << viewExtent.xMinimum() << "," <<
+        "ymin=" << viewExtent.yMinimum() << "," <<
+        "xmax=" << viewExtent.xMaximum() << "," <<
+        "ymax=" << viewExtent.yMaximum() << " " <<
+        "where bookmark_id=" << item->text( 3 );
+        QgsDebugMsg( QString( "Storing bookmark using: %1" ).arg( sql ) );
+
+        char * errmsg;
+        rc = sqlite3_exec( db, sql.toUtf8(), NULL, NULL, &errmsg );
+        if ( rc != SQLITE_OK )
+        {
+          // XXX Provide popup message on failure?
+          QMessageBox::warning( this, tr( "Error updating bookmark" ),
+                                tr( "Failed to update the %1 bookmark. The database said:\n%2" )
+                                .arg( item->text( 0 ) ).arg( errmsg ) );
+          sqlite3_free( errmsg );
+        }
+        // close the database
+        sqlite3_close( db );
+
+        refreshBookmarks();
+
+      }
+      else
+      {
+        QgsDebugMsg( QString( "Can't open database: %1" ).arg( sqlite3_errmsg( db ) ) );
+
+        // XXX This will likely never happen since on open, sqlite creates the
+        //     database if it does not exist.
+        assert( rc == 0 );
+      }
+    }
+  }
+}
+
 void QgsBookmarks::on_btnDelete_clicked()
 {
   // get the current item
@@ -187,7 +254,7 @@ void QgsBookmarks::on_btnZoomTo_clicked()
   zoomToBookmark();
 }
 
-void QgsBookmarks::on_lstBookmarks_doubleClicked( QTreeWidgetItem *lvi )
+void QgsBookmarks::on_lstBookmarks_itemDoubleClicked( QTreeWidgetItem *lvi )
 {
   zoomToBookmark();
 }
diff --git a/src/app/qgsbookmarks.h b/src/app/qgsbookmarks.h
index 8fe9262..f5cfb37 100644
--- a/src/app/qgsbookmarks.h
+++ b/src/app/qgsbookmarks.h
@@ -35,9 +35,10 @@ class QgsBookmarks : public QDialog, private Ui::QgsBookmarksBase
     void restorePosition();
   private slots:
     void saveWindowLocation();
+    void on_btnUpdate_clicked();
     void on_btnDelete_clicked();
     void on_btnZoomTo_clicked();
-    void on_lstBookmarks_doubleClicked( QTreeWidgetItem * );
+    void on_lstBookmarks_itemDoubleClicked( QTreeWidgetItem * );
     void refreshBookmarks();
 
     void on_buttonBox_helpRequested() { QgsContextHelp::run( metaObject()->className() ); }