diff --git a/llvm/include/llvm/FuzzMutate/IRMutator.h b/llvm/include/llvm/FuzzMutate/IRMutator.h
--- a/llvm/include/llvm/FuzzMutate/IRMutator.h
+++ b/llvm/include/llvm/FuzzMutate/IRMutator.h
@@ -95,6 +95,7 @@
   void mutate(BasicBlock &BB, RandomIRBuilder &IB) override;
 };
 
+/// Strategy that deletes instructions when the Module is too large.
 class InstDeleterIRStrategy : public IRMutationStrategy {
 public:
   uint64_t getWeight(size_t CurrentSize, size_t MaxSize,
@@ -105,6 +106,7 @@
   void mutate(Instruction &Inst, RandomIRBuilder &IB) override;
 };
 
+/// Strategy that modifies instruction attributes and operands.
 class InstModificationIRStrategy : public IRMutationStrategy {
 public:
   uint64_t getWeight(size_t CurrentSize, size_t MaxSize,
diff --git a/llvm/unittests/FuzzMutate/StrategiesTest.cpp b/llvm/unittests/FuzzMutate/StrategiesTest.cpp
--- a/llvm/unittests/FuzzMutate/StrategiesTest.cpp
+++ b/llvm/unittests/FuzzMutate/StrategiesTest.cpp
@@ -31,15 +31,13 @@
       Type::getInt64Ty, Type::getFloatTy, Type::getDoubleTy};
 
   std::vector<std::unique_ptr<IRMutationStrategy>> Strategies;
-  Strategies.push_back(
-      std::make_unique<InjectorIRStrategy>(
-          InjectorIRStrategy::getDefaultOps()));
+  Strategies.push_back(std::make_unique<InjectorIRStrategy>(
+      InjectorIRStrategy::getDefaultOps()));
 
   return std::make_unique<IRMutator>(std::move(Types), std::move(Strategies));
 }
 
-template <class Strategy>
-std::unique_ptr<IRMutator> createMutator() {
+template <class Strategy> std::unique_ptr<IRMutator> createMutator() {
   std::vector<TypeGetter> Types{
       Type::getInt1Ty,  Type::getInt8Ty,  Type::getInt16Ty, Type::getInt32Ty,
       Type::getInt64Ty, Type::getFloatTy, Type::getDoubleTy};
@@ -50,8 +48,8 @@
   return std::make_unique<IRMutator>(std::move(Types), std::move(Strategies));
 }
 
-std::unique_ptr<Module> parseAssembly(
-    const char *Assembly, LLVMContext &Context) {
+std::unique_ptr<Module> parseAssembly(const char *Assembly,
+                                      LLVMContext &Context) {
 
   SMDiagnostic Error;
   std::unique_ptr<Module> M = parseAssemblyString(Assembly, Error, Context);
@@ -94,15 +92,15 @@
   // Test that we don't crash even if we can't remove from one of the functions.
 
   StringRef Source = ""
-      "define <8 x i32> @func1() {\n"
-        "ret <8 x i32> undef\n"
-      "}\n"
-      "\n"
-      "define i32 @func2() {\n"
-        "%A9 = alloca i32\n"
-        "%L6 = load i32, i32* %A9\n"
-        "ret i32 %L6\n"
-      "}\n";
+                     "define <8 x i32> @func1() {\n"
+                     "ret <8 x i32> undef\n"
+                     "}\n"
+                     "\n"
+                     "define i32 @func2() {\n"
+                     "%A9 = alloca i32\n"
+                     "%L6 = load i32, i32* %A9\n"
+                     "ret i32 %L6\n"
+                     "}\n";
 
   auto Mutator = createMutator<InstDeleterIRStrategy>();
   ASSERT_TRUE(Mutator);
@@ -319,4 +317,4 @@
       }";
   VerfyDivDidntShuffle(Source);
 }
-}
+} // namespace