diff --git a/Use-Cases.md b/Use-Cases.md
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--- a/Use-Cases.md
+++ b/Use-Cases.md
@@ -114,4 +114,8 @@ Map rotation is useful, for example so that "up" corresponds to the direction in
 
 ### Sub-feature styling
 
-The user wishes to style a feature, e.g. a line string, according to some value that varies across the feature.  It should be possible to "sub-style" a feature, e.g. to vary the color of a GPS tracklog by the speed of movement at that point.
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+The user wishes to style a feature, e.g. a line string, according to some value that varies across the feature.  It should be possible to "sub-style" a feature, e.g. to vary the color of a GPS tracklog by the speed of movement at that point.
+
+### Vector simplification
+
+The user has vector features with a high number of points. To render the feature efficiently it should be possible to (automatically) simplify features based on the current zoom level. Only the visible part should be rendered if the user has zoomed into the feature.
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