hadley/ggplot2 — comment on commit 499c7d1f57925ecb709c1b62bb69b79634efb307
File: R/stat-smooth.r line 9
By wch:

This isn't quite right... The `predictdf.glm` function also calculates confidence intervals (confidence intervals aren't provided by `predict.glm`), although it uses the z distribution instead of t.
Also, small typo: "approximation"