diff --git a/docs/threading_and_tasks_testing.md b/docs/threading_and_tasks_testing.md
index 9bba4a2..e249cc1 100644
--- a/docs/threading_and_tasks_testing.md
+++ b/docs/threading_and_tasks_testing.md
@@ -49,7 +49,7 @@
 Typically this will look something like this:
 
 foo.h
-```
+```c++
 class Foo {
  public:
   Foo() : owning_sequence_(base::SequencedTaskRunnerHandle::Get()) {}
@@ -69,7 +69,7 @@
 ```
 
 foo_unittest.cc
-```
+```c++
 TEST(FooTest, DoSomething) {
   base::test::SingleThreadTaskEnvironment task_environment;
 
@@ -101,7 +101,7 @@
 Typical use case:
 
 foo_service.h
-```
+```c++
 class FooService {
  public:
   FooService()
@@ -130,7 +130,7 @@
 ```
 
 foo_service_unittest.cc
-```
+```c++
 TEST(FooServiceTest, FlushAndReply) {
   base::test::TaskEnvironment task_environment;
 
@@ -203,7 +203,7 @@
 timeouts, etc. without any test-specific seams in the product code, e.g.:
 
 foo_storage.h
-```
+```c++
 class FooStorage {
  public:
   static constexpr base::TimeDelta::kFlushInterval =
@@ -215,7 +215,7 @@
 ```
 
 foo_unittest.cc
-```
+```c++
 class FooStorageTest {
  public:
   FooStorageTest() = default;
@@ -247,7 +247,7 @@
 `TaskEnvironment::RunUntilIdle()` would run the delayed task, signalling the
 event.
 
-```
+```c++
 TEST(FooTest, TimeoutExceeded)
 {
   base::test::TaskEnvironment task_environment{
@@ -328,7 +328,7 @@
 This typically looks like this (in this case `FooTestBase` opts to enforce
 `MainThreadType::UI` and leaves other traits to be specified as desired):
 
-```
+```c++
 // Constructs a FooTestBase with |traits| being forwarded to its
 // TaskEnvironment. MainThreadType always defaults to UI and must not be
 // specified.