diff --git a/doc/stages/filters.griddecimation.rst b/doc/stages/filters.griddecimation.rst
index 04240cb12d..48ff342abd 100755
--- a/doc/stages/filters.griddecimation.rst
+++ b/doc/stages/filters.griddecimation.rst
@@ -3,7 +3,7 @@
 filters.griddecimation
 ============
 
-The **grid decimation filter** keeps only one point in a grid. The point selected could be the highest or the lowest point. It can be used to quickly filter vegetation points in order to keep only the canopy points.
+The **grid decimation filter** transform only one point in each cells of a grid calculated from the points cloud and a resolution therm. The transformation is done by the value information. The selected point could be the highest or the lowest point on the cell. It can be used, for exemple, to quickly filter vegetation points in order to keep only the canopy points.
 
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