diff --git a/HISTORY.md b/HISTORY.md
index d75254fe..fbea2bd7 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -13,6 +13,9 @@
     * NEW Slovak translation, thanks, Peter Lukacovic
     * German
 
+### 2019-12-13
+* added direct relabelling option to pen trails blocks' context menus
+
 ### 2019-12-10
 * NEW Slovak translation, thanks, Peter Lukacovic
 
diff --git a/snap.html b/snap.html
index 5aa4cd4d..70998752 100755
--- a/snap.html
+++ b/snap.html
@@ -6,9 +6,9 @@
         <link rel="shortcut icon" href="src/favicon.ico">
         <script type="text/javascript" src="src/morphic.js?version=2019-11-12"></script>
         <script type="text/javascript" src="src/widgets.js?version=2019-10-16"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2019-12-03"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2019-12-13"></script>
         <script type="text/javascript" src="src/threads.js?version=2019-12-05"></script>
-        <script type="text/javascript" src="src/objects.js?version=2019-12-05"></script>
+        <script type="text/javascript" src="src/objects.js?version=2019-12-13"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-12-07"></script>
         <script type="text/javascript" src="src/paint.js?version=2019-06-27"></script>
         <script type="text/javascript" src="src/lists.js?version=2019-12-08"></script>
diff --git a/src/blocks.js b/src/blocks.js
index bac47187..46b34f48 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2019-December-03';
+modules.blocks = '2019-December-13';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -2851,7 +2851,9 @@ BlockMorph.prototype.userMenu = function () {
         }
     }
 
-    // JIT-compile HOFs - experimental
+    // direct relabelling:
+    // - JIT-compile HOFs - experimental
+    // - vector pen trails
     if (
         contains(
             ['reportMap', 'reportKeep', 'reportFindFirst', 'reportCombine'],
@@ -2897,6 +2899,27 @@ BlockMorph.prototype.userMenu = function () {
                 myself.changed();
             }
         );
+    } else if (
+        contains(
+            ['reportPenTrailsAsCostume', 'reportPentrailsAsSVG'],
+            this.selector
+        )
+    ) {
+        alternatives = {
+            reportPenTrailsAsCostume : 'reportPentrailsAsSVG',
+            reportPentrailsAsSVG : 'reportPenTrailsAsCostume'
+        };
+        menu.addItem(
+            localize(
+                SpriteMorph.prototype.blocks[
+                    alternatives[myself.selector]
+                ].spec
+            ),
+            function () {
+                myself.setSelector(alternatives[myself.selector]);
+                myself.changed();
+            }
+        );
     }
 
     menu.addItem(
diff --git a/src/objects.js b/src/objects.js
index 08b86b27..4a7dfbd0 100644
--- a/src/objects.js
+++ b/src/objects.js
@@ -84,7 +84,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph,  BooleanSlotMorph,
 localize, TableMorph, TableFrameMorph, normalizeCanvas, VectorPaintEditorMorph,
 HandleMorph, AlignmentMorph, Process, XML_Element, WorldMap, copyCanvas*/
 
-modules.objects = '2019-December-05';
+modules.objects = '2019-December-13';
 
 var SpriteMorph;
 var StageMorph;
@@ -688,20 +688,17 @@ SpriteMorph.prototype.initBlocks = function () {
             category: 'pen',
             spec: 'pen trails'
         },
+        reportPentrailsAsSVG: {
+            type: 'reporter',
+            category: 'pen',
+            spec: 'pen vectors'
+        },
         doPasteOn: {
             type: 'command',
             category: 'pen',
             spec: 'paste on %spr'
         },
 
-        // Pen - experimental primitives for development mode
-        reportPentrailsAsSVG: {
-            dev: true,
-            type: 'reporter',
-            category: 'pen',
-            spec: 'pen vectors'
-        },
-
         // Control
         receiveGo: {
             type: 'hat',
@@ -1560,9 +1557,6 @@ SpriteMorph.prototype.blockAlternatives = {
     changeSize: ['setSize'],
     setSize: ['changeSize'],
     
-    reportPenTrailsAsCostume: ['reportPentrailsAsSVG'],
-    reportPentrailsAsSVG: ['reportPenTrailsAsCostume'],
-
     // control:
     doBroadcast: ['doBroadcastAndWait'],
     doBroadcastAndWait: ['doBroadcast'],
@@ -2329,22 +2323,6 @@ SpriteMorph.prototype.blockTemplates = function (category) {
         blocks.push('=');
         blocks.push(this.makeBlockButton(cat));
 
-    // for debugging: ///////////////
-
-        if (this.world().isDevMode) {
-            blocks.push('-');
-            txt = new TextMorph(localize(
-                'development mode \ndebugging primitives:'
-            ));
-            txt.fontSize = 9;
-            txt.setColor(this.paletteTextColor);
-            blocks.push(txt);
-            blocks.push('-');
-            blocks.push(block('reportPentrailsAsSVG'));
-        }
-
-    ////////////////////////////////
-
     } else if (cat === 'control') {
 
         blocks.push(block('receiveGo'));
@@ -8476,22 +8454,6 @@ StageMorph.prototype.blockTemplates = function (category) {
         blocks.push('=');
         blocks.push(this.makeBlockButton(cat));
 
-    // for debugging: ///////////////
-
-        if (this.world().isDevMode) {
-            blocks.push('-');
-            txt = new TextMorph(localize(
-                'development mode \ndebugging primitives:'
-            ));
-            txt.fontSize = 9;
-            txt.setColor(this.paletteTextColor);
-            blocks.push(txt);
-            blocks.push('-');
-            blocks.push(block('reportPentrailsAsSVG'));
-        }
-
-    /////////////////////////////////
-
     } else if (cat === 'control') {
 
         blocks.push(block('receiveGo'));