diff --git a/RgbColor-object-API.md b/RgbColor-object-API.md
index ed95314..828ac0c 100644
--- a/RgbColor-object-API.md
+++ b/RgbColor-object-API.md
@@ -53,4 +53,11 @@ This is a static function, which means you need to call it scoped to the object
 ```
     RgbColor results = RgbColor::LinearBlend(RgbColor(255,0,0), RgbColor(0,255,0), 0.33f);
 ```
-
+### static RgbColor BilinearBlend(RgbColor c00, RgbColor c01, RgbColor c10, RgbColor c11, float x, float y);  
+This will blend between four colors by the amount defined by 2d weighting values.  
+c00 - upper left quadrant color  
+c01 - upper right quadrant color  
+c10 - lower left quadrant color  
+c11 - lower right quadrant color  
+x - unit value (0.0 - 1.0) that defines the blend progress in horizontal space  
+y - unit value (0.0 - 1.0) that defines the blend progress in vertical space  
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