Minor doc clarification

1 files changed, 3 insertions, 1 deletions

diff --git a/src/node.h b/src/node.h
index 9b075fc..42547db 100644
--- a/src/node.h
+++ b/src/node.h
@@ -35,7 +35,9 @@ public:
 	    overloaded to provide specialization for e.g. CSG nodes, primitive nodes etc.
 	    Used for human-readable output. */
 	virtual std::string name() const;
-  /*! Should return a PolySet of the given geometry. Returns NULL if smth. goes wrong */
+  /*! Should return a PolySet of the given geometry. Returns NULL if smth. goes wrong.
+	 This is only called by PolySetEvaluator, to make sure polysets are inserted into 
+	 the cache*/
 	virtual class PolySet *evaluate_polyset(class PolySetEvaluator *) const { return NULL; }
 
 	const std::vector<AbstractNode*> &getChildren() const {