diff --git a/panda/src/pgraph/lensNode.cxx b/panda/src/pgraph/lensNode.cxx
index 1b428d9e98..ae90f61c4b 100644
--- a/panda/src/pgraph/lensNode.cxx
+++ b/panda/src/pgraph/lensNode.cxx
@@ -119,7 +119,8 @@ set_lens_active(int index, bool flag) {
 
 /**
  * Returns true if the given point is within the bounds of the lens of the
- * LensNode (i.e.  if the camera can see the point).
+ * LensNode (i.e.  if the camera can see the point).  The point is assumed to
+ * be relative to the LensNode itself.
  */
 bool LensNode::
 is_in_view(int index, const LPoint3 &pos) {