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doc/texinfo/gmsh.texi

@@ -2431,6 +2431,11 @@ the X, Y and Z components of the translation vector.
 (Not a transformation per-se.) Returns the boundary of the elementary
 entities in @var{transform-list}.
 
+@item CombinedBoundary @{ @var{transform-list} @}
+(Not a transformation per-se.) Returns the boundary of the elementary
+entities, combined as if a single entity, in
+@var{transform-list}. Useful to compute the boundary of a complex part.
+
 @c @item Intersect Line @{ @var{expression-list} @} Surface @{ @var{expression} @}
 @c (Not a transformation per-se.) Returns the intersections of the lines
 @c given in @var{expression-list} with the specified surface.