Fix and document productimg phase.

doc/configuration.rst

@@ -399,3 +399,40 @@ Example
             ],
         }),
     ]
+
+
+Productimg Settings
+===================
+Product images are placed on installation media and provide additional branding
+and Anaconda changes specific to product variants.
+
+Options
+-------
+
+**productimg** = False
+    (*bool*) -- create product images; requires bootable=True
+
+**productimg_install_class**
+    (*scm_dict*, *str*) -- reference to install class **file**
+
+**productimg_po_files**
+    (*scm_dict*, *str*) -- reference to a **directory** with po files for install class translations
+
+
+Example
+-------
+::
+
+    productimg = True
+    productimg_install_class = {
+        "scm": "git",
+        "repo": "http://git.example.com/productimg.git",
+        "branch": None,
+        "file": "fedora23/%(variant_id)s.py",
+    }
+    productimg_po_files = {
+        "scm": "git",
+        "repo": "http://git.example.com/productimg.git",
+        "branch": None,
+        "dir": "po",
+    }