GPUImageGaussianBlurFilter.java is wrong?

https://github.com/cats-oss/android-gpuimage/blob/master/library/src/main/java/jp/co/cyberagent/android/gpuimage/filter/GPUImageGaussianBlurFilter.java

44th line,is it wrong with texelHeightOffset and texelWidthOffset? may be it should be vec2 singleStepOffset = vec2(texelWidthOffset, texelHeightOffset );