Update README.md

README.md

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-GPLASIM
+EXOPLASIM
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 General Circulation Models Planet Simulator (PlaSim) and PUMA
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 This version of PlaSim has been modified to include additional modules
-used for simulating climate on geological timescales. This includes a
-carbon-silicate weathering model (continents only at this point) and
-a glacier model. The glacier model is currently very rudimentary and exists
-only to include the effects of ice sheet elevation, and lacks crucial 
-physics such as spreading, flow, and bedrock denudation.
+used for simulating climate on geological timescales (carbon-silicate 
+weathering on land), different rotation states (i.e. tidally-locked), 
+different atmosphere masses, and arbitrary input spectrum. 
+
+The model has also been adapted to permit a rudimentary glacial model,
+with an adaptive glacier mask and (mostly) unbounded land ice thickness
+(included in surface geopotential height), but no ice flow, denudation,
+or adaptive sea level.
 
 The framework for the glacial model may be adapted in the future to enable
 orogeny, such as might be expected from a coupled plate-tectonics model.