diff --git a/docs/TOFS_pattern.rst b/docs/TOFS_pattern.rst
index ec3bede..20233c8 100644
--- a/docs/TOFS_pattern.rst
+++ b/docs/TOFS_pattern.rst
@@ -325,6 +325,7 @@ We can simplify the ``conf.sls`` with the new ``files_switch`` macro to use in t
 
 
 * This uses ``config.get``, searching for ``ntp:tofs:source_files:Configure NTP`` to determine the list of template files to use.
+* If this returns a result, the default of ``['/etc/ntp.conf.jinja']`` will be appended to it.
 * If this does not yield any results, the default of ``['/etc/ntp.conf.jinja']`` will be used.
 
 In ``libtofs.jinja``, we define this new macro ``files_switch``.
@@ -426,7 +427,6 @@ The list of ``source_files`` can be given:
      tofs:
        source_files:
          Configure NTP:
-           - '/etc/ntp.conf.jinja'
            - '/etc/ntp.conf_alt.jinja'
 
 Resulting in:
@@ -434,10 +434,13 @@ Resulting in:
 .. code-block:: sls
 
          - source:
-           - salt://ntp/files/theminion/etc/ntp.conf.jinja
            - salt://ntp/files/theminion/etc/ntp.conf_alt.jinja
-           - salt://ntp/files/Debian/etc/ntp.conf.jinja
+           - salt://ntp/files/theminion/etc/ntp.conf.jinja
            - salt://ntp/files/Debian/etc/ntp.conf_alt.jinja
-           - salt://ntp/files/default/etc/ntp.conf.jinja
+           - salt://ntp/files/Debian/etc/ntp.conf.jinja
            - salt://ntp/files/default/etc/ntp.conf_alt.jinja
+           - salt://ntp/files/default/etc/ntp.conf.jinja
+
+Note: This does *not* override the default value.
+Rather, the value from the pillar/config is prepended to the default.
 
diff --git a/nginx/libtofs.jinja b/nginx/libtofs.jinja
index da656a5..9609be1 100644
--- a/nginx/libtofs.jinja
+++ b/nginx/libtofs.jinja
@@ -10,7 +10,7 @@
 
     Params:
       * source_files: ordered list of files to look for
-      * lookup: key under '<tplroot>:tofs:source_files' to override
+      * lookup: key under '<tplroot>:tofs:source_files' to prepend to the
         list of source files
       * default_files_switch: if there's no config (e.g. pillar)
         '<tplroot>:tofs:files_switch' this is the ordered list of grains to
@@ -55,14 +55,13 @@
       tplroot ~ ':tofs:files_switch',
       default_files_switch
   ) %}
-  {#- Lookup source_files (v2), files (v1), or fallback to source_files parameter #}
+  {#- Lookup source_files (v2), files (v1), or fallback to an empty list #}
   {%- set src_files = salt['config.get'](
       tplroot ~ ':tofs:source_files:' ~ lookup,
-      salt['config.get'](
-          tplroot ~ ':tofs:files:' ~ lookup,
-          source_files
-      )
+      salt['config.get'](tplroot ~ ':tofs:files:' ~ lookup, [])
   ) %}
+  {#- Append the default source_files #}
+  {%- set src_files = src_files + source_files %}
   {#- Only add to [''] when supporting older TOFS implementations #}
   {%- set path_prefix_exts = [''] %}
   {%- if v1_path_prefix != '' %}
@@ -83,18 +82,25 @@
     {%- for fs in fsl %}
       {%- for src_file in src_files %}
         {%- if fs %}
-          {%- set fs_dir = salt['config.get'](fs, fs) %}
+          {%- set fs_dirs = salt['config.get'](fs, fs) %}
         {%- else %}
-          {%- set fs_dir = salt['config.get'](tplroot ~ ':tofs:dirs:default', 'default') %}
+          {%- set fs_dirs = salt['config.get'](tplroot ~ ':tofs:dirs:default', 'default') %}
         {%- endif %}
-        {%- set url = [
-            '- salt:/',
-            path_prefix_inc_ext.strip('/'),
-            files_dir.strip('/'),
-            fs_dir.strip('/'),
-            src_file.strip('/'),
-        ] | select | join('/') %}
+        {#- Force the `config.get` lookup result as a list where necessary #}
+        {#- since we need to also handle grains that are lists #}
+        {%- if fs_dirs is string %}
+          {%- set fs_dirs = [fs_dirs] %}
+        {%- endif %}
+        {%- for fs_dir in fs_dirs %}
+          {%- set url = [
+              '- salt:/',
+              path_prefix_inc_ext.strip('/'),
+              files_dir.strip('/'),
+              fs_dir.strip('/'),
+              src_file.strip('/'),
+          ] | select | join('/') %}
 {{ url | indent(indent_width, true) }}
+        {%- endfor %}
       {%- endfor %}
     {%- endfor %}
   {%- endfor %}