diff --git a/src/assets/blockly/custom_blocks.js b/src/assets/blockly/custom_blocks.js
index 14cddac32a75a38a32662fe41f3cfc45ffd8cafd..7a1a00bd65407b8aa49e83e26eec02e446e85cb0 100644
--- a/src/assets/blockly/custom_blocks.js
+++ b/src/assets/blockly/custom_blocks.js
@@ -1425,7 +1425,7 @@ Blockly.Blocks['example_variable_typed'] = {
       this.setInputsInline( true );   
       this.setOutput(true, 'String');
       this.setColour(colourtexts);
-      this.setTooltip("Set values to characteristics of a refernced service.");
+      this.setTooltip("Set values to characteristics of a referenced service.");
       this.setHelpUrl("");
 
     },