diff --git a/src/libpriv/rpmostree-core.c b/src/libpriv/rpmostree-core.c
index be66639881..e867b44bb5 100644
--- a/src/libpriv/rpmostree-core.c
+++ b/src/libpriv/rpmostree-core.c
@@ -1610,6 +1610,11 @@ check_goal_solution (RpmOstreeContext *self,
                                         dnf_package_get_nevra (old_pkg),
                                         dnf_package_get_nevra (new_pkg), new_repo);
           }
+        rpmostree_output_message ("This likely means that some of your layered packages "
+                                  "have requirements on newer or older versions of some "
+                                  "base packages. `rpm-ostree cleanup -m` may help. For "
+                                  "more details, see: "
+                                  "https://github.com/projectatomic/rpm-ostree/issues/415");
 
         return glnx_throw (error, "Some base packages would be replaced");
       }