The ANSI/ANS-5.1 [1] standard on decay heat in light water reactors is one of the most widely used standards for reactor design and safety analysis. The standard was last revised and issued in 2005. The 2005 revision included several important accomplishments, including incorporation of ENDF/B-VI nuclear data in the development of correction factors implemented in the standard, and revisions to the 'simplified method.' The status of the 2005 ANS-5.1 standard has been summarized previously [2]. Future revisions of the standard under consideration, as proposed by the working group, were to (a) improve the neutron capture effect specification, (b) include contributions from actinides not already addressed by the standard, and (c) specify values for the total recoverable decay energy Q for major fissionable elements. These items are carried over from recommendations by Dickens et al. [3] during development of the 1994 revision. The current working group has also identified the representation of decay heat uncertainties as an area for improvement. This paper discusses recent development activities to further improve and extend the utility of the ANS-5.1 decay heat standard. These developments are in progress, and this paper summarizes the status of the activities. The proposed revisions discussed in this paper are being considered by the working group for adoption in the next publication of the standard.