diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 05265411c..3572ca181 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -2420,12 +2420,15 @@ static RegisterPrimOp primop_listToAttrs({
       Construct a set from a list specifying the names and values of each
       attribute. Each element of the list should be a set consisting of a
       string-valued attribute `name` specifying the name of the attribute,
-      and an attribute `value` specifying its value. Example:
+      and an attribute `value` specifying its value.
+      In case of duplicate occurrences of the same name, the first
+      takes precedence.  Example:
 
       ```nix
       builtins.listToAttrs
         [ { name = "foo"; value = 123; }
           { name = "bar"; value = 456; }
+          { name = "bar"; value = 420; }
         ]
       ```