diff --git a/mlir/examples/toy/Ch2/mlir/MLIRGen.cpp b/mlir/examples/toy/Ch2/mlir/MLIRGen.cpp
--- a/mlir/examples/toy/Ch2/mlir/MLIRGen.cpp
+++ b/mlir/examples/toy/Ch2/mlir/MLIRGen.cpp
@@ -313,7 +313,7 @@
       operands.push_back(arg);
     }
 
-    // Builting calls have their custom operation, meaning this is a
+    // Builtin calls have their custom operation, meaning this is a
     // straightforward emission.
     if (callee == "transpose") {
       if (call.getArgs().size() != 1) {
@@ -324,9 +324,9 @@
       return builder.create<TransposeOp>(location, operands[0]);
     }
 
-    // Otherwise this is a call to a user-defined function. Calls to ser-defined
-    // functions are mapped to a custom call that takes the callee name as an
-    // attribute.
+    // Otherwise this is a call to a user-defined function. Calls to
+    // user-defined functions are mapped to a custom call that takes the callee
+    // name as an attribute.
     return builder.create<GenericCallOp>(location, callee, operands);
   }
 
diff --git a/mlir/examples/toy/Ch3/mlir/MLIRGen.cpp b/mlir/examples/toy/Ch3/mlir/MLIRGen.cpp
--- a/mlir/examples/toy/Ch3/mlir/MLIRGen.cpp
+++ b/mlir/examples/toy/Ch3/mlir/MLIRGen.cpp
@@ -313,7 +313,7 @@
       operands.push_back(arg);
     }
 
-    // Builting calls have their custom operation, meaning this is a
+    // Builtin calls have their custom operation, meaning this is a
     // straightforward emission.
     if (callee == "transpose") {
       if (call.getArgs().size() != 1) {
@@ -324,9 +324,9 @@
       return builder.create<TransposeOp>(location, operands[0]);
     }
 
-    // Otherwise this is a call to a user-defined function. Calls to ser-defined
-    // functions are mapped to a custom call that takes the callee name as an
-    // attribute.
+    // Otherwise this is a call to a user-defined function. Calls to
+    // user-defined functions are mapped to a custom call that takes the callee
+    // name as an attribute.
     return builder.create<GenericCallOp>(location, callee, operands);
   }
 
diff --git a/mlir/examples/toy/Ch4/mlir/MLIRGen.cpp b/mlir/examples/toy/Ch4/mlir/MLIRGen.cpp
--- a/mlir/examples/toy/Ch4/mlir/MLIRGen.cpp
+++ b/mlir/examples/toy/Ch4/mlir/MLIRGen.cpp
@@ -317,7 +317,7 @@
       operands.push_back(arg);
     }
 
-    // Builting calls have their custom operation, meaning this is a
+    // Builtin calls have their custom operation, meaning this is a
     // straightforward emission.
     if (callee == "transpose") {
       if (call.getArgs().size() != 1) {
@@ -328,9 +328,9 @@
       return builder.create<TransposeOp>(location, operands[0]);
     }
 
-    // Otherwise this is a call to a user-defined function. Calls to ser-defined
-    // functions are mapped to a custom call that takes the callee name as an
-    // attribute.
+    // Otherwise this is a call to a user-defined function. Calls to
+    // user-defined functions are mapped to a custom call that takes the callee
+    // name as an attribute.
     return builder.create<GenericCallOp>(location, callee, operands);
   }
 
diff --git a/mlir/examples/toy/Ch5/mlir/MLIRGen.cpp b/mlir/examples/toy/Ch5/mlir/MLIRGen.cpp
--- a/mlir/examples/toy/Ch5/mlir/MLIRGen.cpp
+++ b/mlir/examples/toy/Ch5/mlir/MLIRGen.cpp
@@ -317,7 +317,7 @@
       operands.push_back(arg);
     }
 
-    // Builting calls have their custom operation, meaning this is a
+    // Builtin calls have their custom operation, meaning this is a
     // straightforward emission.
     if (callee == "transpose") {
       if (call.getArgs().size() != 1) {
@@ -328,9 +328,9 @@
       return builder.create<TransposeOp>(location, operands[0]);
     }
 
-    // Otherwise this is a call to a user-defined function. Calls to ser-defined
-    // functions are mapped to a custom call that takes the callee name as an
-    // attribute.
+    // Otherwise this is a call to a user-defined function. Calls to
+    // user-defined functions are mapped to a custom call that takes the callee
+    // name as an attribute.
     return builder.create<GenericCallOp>(location, callee, operands);
   }
 
diff --git a/mlir/examples/toy/Ch6/mlir/MLIRGen.cpp b/mlir/examples/toy/Ch6/mlir/MLIRGen.cpp
--- a/mlir/examples/toy/Ch6/mlir/MLIRGen.cpp
+++ b/mlir/examples/toy/Ch6/mlir/MLIRGen.cpp
@@ -317,7 +317,7 @@
       operands.push_back(arg);
     }
 
-    // Builting calls have their custom operation, meaning this is a
+    // Builtin calls have their custom operation, meaning this is a
     // straightforward emission.
     if (callee == "transpose") {
       if (call.getArgs().size() != 1) {
@@ -328,9 +328,9 @@
       return builder.create<TransposeOp>(location, operands[0]);
     }
 
-    // Otherwise this is a call to a user-defined function. Calls to ser-defined
-    // functions are mapped to a custom call that takes the callee name as an
-    // attribute.
+    // Otherwise this is a call to a user-defined function. Calls to
+    // user-defined functions are mapped to a custom call that takes the callee
+    // name as an attribute.
     return builder.create<GenericCallOp>(location, callee, operands);
   }
 
diff --git a/mlir/examples/toy/Ch7/mlir/MLIRGen.cpp b/mlir/examples/toy/Ch7/mlir/MLIRGen.cpp
--- a/mlir/examples/toy/Ch7/mlir/MLIRGen.cpp
+++ b/mlir/examples/toy/Ch7/mlir/MLIRGen.cpp
@@ -501,7 +501,7 @@
       operands.push_back(arg);
     }
 
-    // Builting calls have their custom operation, meaning this is a
+    // Builtin calls have their custom operation, meaning this is a
     // straightforward emission.
     if (callee == "transpose") {
       if (call.getArgs().size() != 1) {
@@ -512,9 +512,9 @@
       return builder.create<TransposeOp>(location, operands[0]);
     }
 
-    // Otherwise this is a call to a user-defined function. Calls to ser-defined
-    // functions are mapped to a custom call that takes the callee name as an
-    // attribute.
+    // Otherwise this is a call to a user-defined function. Calls to
+    // user-defined functions are mapped to a custom call that takes the callee
+    // name as an attribute.
     auto calledFuncIt = functionMap.find(callee);
     if (calledFuncIt == functionMap.end()) {
       emitError(location) << "no defined function found for '" << callee << "'";