diff --git a/libraries/ESP8266WebServer/examples/SDWebServer/SdRoot/edit/index.htm b/libraries/ESP8266WebServer/examples/SDWebServer/SdRoot/edit/index.htm
index 87254fc70..f535601e7 100644
--- a/libraries/ESP8266WebServer/examples/SDWebServer/SdRoot/edit/index.htm
+++ b/libraries/ESP8266WebServer/examples/SDWebServer/SdRoot/edit/index.htm
@@ -451,8 +451,11 @@
             switch(ext){
               case "txt":
               case "htm":
+              case "html":
               case "js":
+              case "json":
               case "c":
+              case "h":
               case "cpp":
               case "css":
               case "xml":
@@ -469,6 +472,7 @@
               case "png":
               case "jpg":
               case "gif":
+              case "ico":
                 return true;
             }
           }