That comment in the log was just a typo. We used a separate branch called ‘FleXSurface’ to develop the fluid surface shader and related changes. Today I merged the FleXSurface branch back into the FleX branch so I could push it out on Github. The comment should have read "‘Merge branch FleXSurface’ of ssh://stl-git.nvidia/home/repo/UnrealEngine into FleX’.