diff --git a/src/renderer/sw_engine/tvgSwPostEffect.cpp b/src/renderer/sw_engine/tvgSwPostEffect.cpp
index dc2aac02..6dd55258 100644
--- a/src/renderer/sw_engine/tvgSwPostEffect.cpp
+++ b/src/renderer/sw_engine/tvgSwPostEffect.cpp
@@ -108,6 +108,7 @@ static void _gaussianFilter(uint8_t* dst, uint8_t* src, int32_t stride, int32_t
 }
 
 
+//Fast Almost-Gaussian Filtering Method by Peter Kovesi
 static int _gaussianInit(SwGaussianBlur* data, float sigma, int quality)
 {
     const auto MAX_LEVEL = SwGaussianBlur::MAX_LEVEL;