diff --git a/[GSoC]ChangeLog b/[GSoC]ChangeLog
index 076a7ebf0..f3c597cd5 100644
--- a/[GSoC]ChangeLog
+++ b/[GSoC]ChangeLog
@@ -1,3 +1,9 @@
+2020-06-19  Anuj Verma  <anujv@iitbhilai.ac.in>
+
+	* include/freetype/ftimage.h (FT_Render_Mode_): Added new
+	  pixel mode `FT_PIXEL_MODE_GRAY16' which will be used
+	  to represent signed values while rendering to SDF bitmap.
+
 2020-06-19  Anuj Verma  <anujv@iitbhilai.ac.in>
 
 	* include/freetype/freetype.h (FT_Render_Mode_): Added new
diff --git a/include/freetype/ftimage.h b/include/freetype/ftimage.h
index 29b907a75..426b09441 100644
--- a/include/freetype/ftimage.h
+++ b/include/freetype/ftimage.h
@@ -157,6 +157,12 @@ FT_BEGIN_HEADER
    *     in font files according to the OpenType specification.  We haven't
    *     found a single font using this format, however.
    *
+   *   FT_PIXEL_MODE_GRAY16 ::
+   *     A 16-bit per pixel bitmap used to represent signed distances in a 
+   *     signed distance field bitmap.  This is currently only used while
+   *     rendering using @FT_RENDER_MODE_SDF.  Note that this is a 2.14
+   *     fixed-point fractional value.
+   *
    *   FT_PIXEL_MODE_LCD ::
    *     An 8-bit bitmap, representing RGB or BGR decimated glyph images used
    *     for display on LCD displays; the bitmap is three times wider than
@@ -184,6 +190,7 @@ FT_BEGIN_HEADER
     FT_PIXEL_MODE_GRAY,
     FT_PIXEL_MODE_GRAY2,
     FT_PIXEL_MODE_GRAY4,
+    FT_PIXEL_MODE_GRAY16,
     FT_PIXEL_MODE_LCD,
     FT_PIXEL_MODE_LCD_V,
     FT_PIXEL_MODE_BGRA,