This is an announcement for the paper "Smooth extensions of functions on separable Banach spaces" by D. Azagra, R. Fry, and L. Keener. Abstract: Let $X$ be a Banach space with a separable dual $X^{*}$. Let $Y\subset X$ be a closed subspace, and $f:Y\to\mathbb{R}$ a $C^{1}$-smooth function. Then we show there is a $C^{1}$ extension of $f$ to $X$. Archive classification: math.FA Mathematics Subject Classification: 46B20 Remarks: 14 pages The source file(s), AFKJune14.tex: 44778 bytes, is(are) stored in gzipped form as 0906.2989.gz with size 14kb. The corresponding postcript file has gzipped size 97kb. Submitted from: dazagra@gmail.com The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/0906.2989 or http://arXiv.org/abs/0906.2989 or by email in unzipped form by transmitting an empty message with subject line uget 0906.2989 or in gzipped form by using subject line get 0906.2989 to: math@arXiv.org.