diff --git a/[GSoC]ChangeLog b/[GSoC]ChangeLog
index a4bf58866..2d606b02e 100644
--- a/[GSoC]ChangeLog
+++ b/[GSoC]ChangeLog
@@ -1,3 +1,12 @@
+2020-06-26  Anuj Verma  <anujv@iitbhilai.ac.in>
+
+	* include/freetype/ftimage.h (FT_RASTER_FLAG_): Added
+	  a new raster flag `FT_RASTER_FLAG_SDF'. The `ftsdf'
+	  rasterizer will only render if this flag is set.
+
+	* src/sdf/ftsdfrend.c (ft_sdf_render): Set the `flags' field
+	  of `FT_Raster_Params' to `FT_RASTER_FLAG_SDF'.
+	  
 2020-06-26  Anuj Verma  <anujv@iitbhilai.ac.in>
 
 	* src/sdf/ftsdf.c (sdf_shape_dump): Use `FT_TRACEX'
diff --git a/include/freetype/ftimage.h b/include/freetype/ftimage.h
index 426b09441..72bf8c441 100644
--- a/include/freetype/ftimage.h
+++ b/include/freetype/ftimage.h
@@ -969,11 +969,17 @@ FT_BEGIN_HEADER
    *     will be clipped to a box specified in the `clip_box` field of the
    *     @FT_Raster_Params structure.  Otherwise, the `clip_box` is
    *     effectively set to the bounding box and all spans are generated.
+   *
+   *   FT_RASTER_FLAG_SDF ::
+   *     This flag is set to indicate that a signed distance field glyph
+   *     image should be generated.  This is only used while rendering with
+   *     `FT_RENDER_MODE_SDF' render mode.
    */
 #define FT_RASTER_FLAG_DEFAULT  0x0
 #define FT_RASTER_FLAG_AA       0x1
 #define FT_RASTER_FLAG_DIRECT   0x2
 #define FT_RASTER_FLAG_CLIP     0x4
+#define FT_RASTER_FLAG_SDF      0x8
 
   /* these constants are deprecated; use the corresponding */
   /* `FT_RASTER_FLAG_XXX` values instead                   */
diff --git a/src/sdf/ftsdfrend.c b/src/sdf/ftsdfrend.c
index 2aaf81287..d93df3de1 100644
--- a/src/sdf/ftsdfrend.c
+++ b/src/sdf/ftsdfrend.c
@@ -244,7 +244,7 @@
     /* set up parameters */
     params.target = bitmap;
     params.source = outline;
-    params.flags  = 0;
+    params.flags  = FT_RASTER_FLAG_SDF;
 
     /* render the outline */
     error = render->raster_render( render->raster, &params );