diff --git a/diskimage_builder/elements/cache-url/README.rst b/diskimage_builder/elements/cache-url/README.rst
index 5d30c9ac..ec00c7ee 100644
--- a/diskimage_builder/elements/cache-url/README.rst
+++ b/diskimage_builder/elements/cache-url/README.rst
@@ -1,4 +1,10 @@
 =========
 cache-url
 =========
+
 A helper script to download images into a local cache.
+
+**NOTE** : on RedHat platforms, ensure the curl binary is available.
+Due to conflicting differences in platform usage of ```curl-minimal``
+and ```curl``, the usual package dependency methods do not work for
+this package.
diff --git a/diskimage_builder/elements/cache-url/pkg-map b/diskimage_builder/elements/cache-url/pkg-map
index fa4fd956..bde555be 100644
--- a/diskimage_builder/elements/cache-url/pkg-map
+++ b/diskimage_builder/elements/cache-url/pkg-map
@@ -1,4 +1,9 @@
 {
+    "family": {
+        "redhat": {
+            "curl": ""
+        }
+    },
     "distro": {
         "gentoo": {
             "curl": "net-misc/curl"