diff --git a/README.md b/README.md
index aa75a81..65b2ab2 100644
--- a/README.md
+++ b/README.md
@@ -137,7 +137,7 @@ impl Calculator {
     }
 
     // sync function
-    #[tool(description = "Calculate the sum of two numbers")]
+    #[tool(description = "Calculate the difference of two numbers")]
     fn sub(
         &self,
         #[tool(param)]
diff --git a/examples/servers/src/common/calculator.rs b/examples/servers/src/common/calculator.rs
index f2de8f6..68beecc 100644
--- a/examples/servers/src/common/calculator.rs
+++ b/examples/servers/src/common/calculator.rs
@@ -20,7 +20,7 @@ impl Calculator {
         (a + b).to_string()
     }
 
-    #[tool(description = "Calculate the sub of two numbers")]
+    #[tool(description = "Calculate the difference of two numbers")]
     fn sub(
         &self,
         #[tool(param)]