diff --git a/src/main/webapp/com/ardublock/reference/404.html b/src/main/webapp/com/ardublock/reference/404.html
deleted file mode 100644
index 643ff52ed36f20311dba4907ec8fe40548f74ee5..0000000000000000000000000000000000000000
--- a/src/main/webapp/com/ardublock/reference/404.html
+++ /dev/null
@@ -1,4 +0,0 @@
-<html>
-<font  size=+3 color=red>not found</font>
-</html>
-
diff --git a/src/main/webapp/com/ardublock/reference/loop.html b/src/main/webapp/com/ardublock/reference/loop.html
deleted file mode 100644
index 8cf004c868ce2637dbd026e3e94f438896755a81..0000000000000000000000000000000000000000
--- a/src/main/webapp/com/ardublock/reference/loop.html
+++ /dev/null
@@ -1,6 +0,0 @@
-<html>
-<img style="-webkit-user-select: none"  src="loop.png" alt="image" ></br>
-<font color=red>info Text</font> </br>
-<font color=blue>Bild</font></br>
-<font size=-2>Troubleshooting</font></br>
-</html>
diff --git a/src/main/webapp/com/ardublock/reference/loop.png b/src/main/webapp/com/ardublock/reference/loop.png
deleted file mode 100644
index 557e15745689ff62d67732c87d2310aaedc5dcf0..0000000000000000000000000000000000000000
Binary files a/src/main/webapp/com/ardublock/reference/loop.png and /dev/null differ
diff --git a/src/main/webapp/com/ardublock/reference/program_comment.html b/src/main/webapp/com/ardublock/reference/program_comment.html
deleted file mode 100644
index 3fef8b052b72428b7e5ecb5e3841e220d3507b02..0000000000000000000000000000000000000000
--- a/src/main/webapp/com/ardublock/reference/program_comment.html
+++ /dev/null
@@ -1,7 +0,0 @@
-<html>
-<img style="-webkit-user-select: none"  src="program_comment.png" alt="image" ></br>
-<font size=+2>program_comment</font></br>
-<font color=red>info Text</font> </br>
-<font color=blue>Bild</font></br>
-<font size=-2>Troubleshooting</font></br>
-</html>
diff --git a/src/main/webapp/com/ardublock/reference/program_comment.png b/src/main/webapp/com/ardublock/reference/program_comment.png
deleted file mode 100644
index 0124bd608c1edcddead3f9c1c348036e8fe2828e..0000000000000000000000000000000000000000
Binary files a/src/main/webapp/com/ardublock/reference/program_comment.png and /dev/null differ