diff --git a/Include/tesselator.h b/Include/tesselator.h
index 38e05f1..3d43155 100755
--- a/Include/tesselator.h
+++ b/Include/tesselator.h
@@ -118,10 +118,15 @@
 // TESS_CONSTRAINED_DELAUNAY_TRIANGULATION
 //   If enabled, the initial triagulation is improved with non-robust Constrained Delayney triangulation.
 //   Disable by default.
+//
+// TESS_REVERSE_CONTOURS
+//   If enabled, tessAddContour() will treat CW contours as CCW and vice versa
+//   Disabled by default.
 
 enum TessOption
 {
 	TESS_CONSTRAINED_DELAUNAY_TRIANGULATION,
+	TESS_REVERSE_CONTOURS
 };
 
 typedef float TESSreal;
diff --git a/Source/tess.c b/Source/tess.c
index 8059bf4..a2f5e14 100755
--- a/Source/tess.c
+++ b/Source/tess.c
@@ -629,6 +629,8 @@
 	tess->bmax[0] = 0;
 	tess->bmax[1] = 0;
 
+	tess->reverseContours = 0;
+    
 	tess->windingRule = TESS_WINDING_ODD;
 
 	if (tess->alloc.regionBucketSize < 16)
@@ -973,8 +975,8 @@
 		* vertices in such an order that a CCW contour will add +1 to
 		* the winding number of the region inside the contour.
 		*/
-		e->winding = 1;
-		e->Sym->winding = -1;
+        e->winding = tess->reverseContours ? -1 : 1;
+        e->Sym->winding = tess->reverseContours ? 1 : -1;
 	}
 }
 
@@ -985,6 +987,9 @@
 	case TESS_CONSTRAINED_DELAUNAY_TRIANGULATION:
 		tess->processCDT = value > 0 ? 1 : 0;
 		break;
+	case TESS_REVERSE_CONTOURS:
+		tess->reverseContours = value > 0 ? 1 : 0;
+		break;
 	}
 }
 
diff --git a/Source/tess.h b/Source/tess.h
index c1f981f..30fda27 100755
--- a/Source/tess.h
+++ b/Source/tess.h
@@ -62,7 +62,8 @@
 	TESSreal bmax[2];
 
 	int processCDT;	/* option to run Constrained Delayney pass. */
-
+	int reverseContours; /* tessAddContour() will treat CCW contours as CW and vice versa */
+    
 	/*** state needed for the line sweep ***/
 	int	windingRule;	/* rule for determining polygon interior */