diff --git a/src/graphicswin.cpp b/src/graphicswin.cpp
index 33fe9b5..806c32a 100644
--- a/src/graphicswin.cpp
+++ b/src/graphicswin.cpp
@@ -113,6 +113,7 @@ const GraphicsWindow::MenuEntry GraphicsWindow::menu[] = {
 { 1, "&Workplane",                  MNU_WORKPLANE,      0,       IN, mReq  },
 { 1, NULL,                          0,                  0,       IN, NULL  },
 { 1, "Line &Segment",               MNU_LINE_SEGMENT,   'S',     IN, mReq  },
+{ 1, "C&onstruction Line Segment",  MNU_CONSTR_SEGMENT, S|'S',   IN, mReq  },
 { 1, "&Rectangle",                  MNU_RECTANGLE,      'R',     IN, mReq  },
 { 1, "&Circle",                     MNU_CIRCLE,         'C',     IN, mReq  },
 { 1, "&Arc of a Circle",            MNU_ARC,            'A',     IN, mReq  },
@@ -954,6 +955,7 @@ void GraphicsWindow::MenuRequest(int id) {
         case MNU_ARC: s = "click point on arc (draws anti-clockwise)"; goto c;
         case MNU_DATUM_POINT: s = "click to place datum point"; goto c;
         case MNU_LINE_SEGMENT: s = "click first point of line segment"; goto c;
+        case MNU_CONSTR_SEGMENT: s = "click first point of construction line segment"; goto c;
         case MNU_CUBIC: s = "click first point of cubic segment"; goto c;
         case MNU_CIRCLE: s = "click center of circle"; goto c;
         case MNU_WORKPLANE: s = "click origin of workplane"; goto c;
diff --git a/src/mouse.cpp b/src/mouse.cpp
index 08cbf72..9803be9 100644
--- a/src/mouse.cpp
+++ b/src/mouse.cpp
@@ -808,7 +808,9 @@ void GraphicsWindow::MouseLeftDown(double mx, double my) {
             break;
 
         case MNU_LINE_SEGMENT:
+        case MNU_CONSTR_SEGMENT:
             hr = AddRequest(Request::LINE_SEGMENT);
+            SK.GetRequest(hr)->construction = (pending.operation == MNU_CONSTR_SEGMENT);
             SK.GetEntity(hr.entity(1))->PointForceTo(v);
             ConstrainPointByHovered(hr.entity(1));
 
@@ -1051,6 +1053,7 @@ void GraphicsWindow::MouseLeftDown(double mx, double my) {
 
             // Create a new line segment, so that we continue drawing.
             hRequest hr = AddRequest(Request::LINE_SEGMENT);
+            SK.GetRequest(hr)->construction = SK.GetRequest(pending.request)->construction;
             SK.GetEntity(hr.entity(1))->PointForceTo(v);
             // Displace the second point of the new line segment slightly,
             // to avoid creating zero-length edge warnings.
diff --git a/src/ui.h b/src/ui.h
index 42d727e..0bb59e7 100644
--- a/src/ui.h
+++ b/src/ui.h
@@ -377,6 +377,7 @@ public:
         MNU_DATUM_POINT,
         MNU_WORKPLANE,
         MNU_LINE_SEGMENT,
+        MNU_CONSTR_SEGMENT,
         MNU_CIRCLE,
         MNU_ARC,
         MNU_RECTANGLE,