Renaming Method Parameters in Method Viewer

I've come across an issue when attempting to rename a parameter in the Method Parameters tab in the Method Viewer. I have a parameter named userID that I'm trying to change to all lowercase - userid. However, when I make the change it reverts back to the original camel case spelling. I have to rename it to something else or clear the field altogether just to rename the parameter. Not a major bug but minor annoyances like this tend to add up.