diff --git "a/Webduino x \346\250\202\351\253\230 EV3.pdf" "b/Webduino x \346\250\202\351\253\230 EV3.pdf"
new file mode 100644
index 0000000..69db1d0
Binary files /dev/null and "b/Webduino x \346\250\202\351\253\230 EV3.pdf" differ
diff --git a/blockly/blocks.js b/blockly/blocks.js
index 224e427..1cfdb2f 100644
--- a/blockly/blocks.js
+++ b/blockly/blocks.js
@@ -34,7 +34,7 @@ Blockly.Blocks['ev3bt_new'] = {
         this.setOutput(true);
         this.setColour(230);
         this.setTooltip('');
-        this.setHelpUrl('https://tutorials.webduino.io/');
+        this.setHelpUrl('');
     }
 };
 
@@ -58,7 +58,7 @@ Blockly.Blocks['ev3bt_sendmsg'] = {
         this.setNextStatement(true, null);
         this.setColour(65);
         this.setTooltip('');
-        this.setHelpUrl('https://tutorials.webduino.io/');
+        this.setHelpUrl('');
     }
 };
 
@@ -78,7 +78,7 @@ Blockly.Blocks['ev3bt_recv'] = {
         this.setNextStatement(true, null);
         this.setColour(65);
         this.setTooltip('');
-        this.setHelpUrl('https://tutorials.webduino.io/');
+        this.setHelpUrl('');
     }
 };
 
@@ -92,6 +92,6 @@ Blockly.Blocks['ev3bt_getmsg'] = {
         this.setOutput(true, null);
         this.setColour(35);
         this.setTooltip('');
-        this.setHelpUrl('https://tutorials.webduino.io/');
+        this.setHelpUrl('');
     }
 };
\ No newline at end of file