diff --git a/src/main/java/gov/usgs/earthquake/nshmp/tree/Trees.java b/src/main/java/gov/usgs/earthquake/nshmp/tree/Trees.java
index f3566a1291801a4883e1059e6150c58662087a34..33e51fc69ae608fb43de913684cb69e0316367e7 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/tree/Trees.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/tree/Trees.java
@@ -16,7 +16,8 @@ public class Trees {
 
   /**
    * Transpose a list of logic trees to a new logic tree of immutable lists.
-   * Supplied logic trees are assumed to all have same branch names and IDs.
+   * Supplied logic trees are assumed to all have same branch names, IDs and
+   * weights.
    *
    * @param <T> the value type of the supplied logic tree
    * @param treeList the list of logic trees to transpose