diff --git a/README.md b/README.md
index 4063ea1..79532d4 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,11 @@ Preview map layer files in your web browser using [Sublime Text 3](https://www.s
 ## Supported Formats
 
   - [GeoJSON](https://geojson.org/)
+
+    Currently support the following types:
+    - [Features](https://tools.ietf.org/html/rfc7946#section-3.2)
+    - [FeatureCollections](https://tools.ietf.org/html/rfc7946#section-3.3)
+
   - [TopoJSON](https://github.com/topojson/topojson/wiki)
 
 ## Installation
diff --git a/map_preview.py b/map_preview.py
index 92e38b0..e99f5e8 100644
--- a/map_preview.py
+++ b/map_preview.py
@@ -45,18 +45,23 @@ def run(self, edit):
             # check if json valid spatial type
             if "type" in validateJson:
                 # check if valid GeoJSON
-                if validateJson["type"] == "FeatureCollection":
+                if validateJson["type"] == "FeatureCollection" or validateJson["type"] == "Feature":
                     type = "geojson"
                     html = wm.render(viewText, type)
-                else:
+                elif validateJson["type"] == "Topology":
                     type = "topojson"
                     html = wm.render(viewText, type)
 
-                # update output HTML file
-                tmp_fullpath = get_temp_preview_path(view)
-                save_utf8(tmp_fullpath, html)
+                try:
+                    html
+                except NameError:
+                    sublime.error_message("Could not convert file.\n\n Not valid GeoJSON or TopoJSON")
+                else:
+                    # update output HTML file
+                    tmp_fullpath = get_temp_preview_path(view)
+                    save_utf8(tmp_fullpath, html)
 
-                webbrowser.open_new_tab("file:///" + tmp_fullpath)
+                    webbrowser.open_new_tab("file:///" + tmp_fullpath)
 
             else:
                 sublime.error_message("Could not convert file.\n\n Not valid spatial type")