diff --git a/googletest/docs/primer.md b/googletest/docs/primer.md
index ae03105..0356968 100644
--- a/googletest/docs/primer.md
+++ b/googletest/docs/primer.md
@@ -5,9 +5,9 @@
 *googletest* helps you write better C++ tests.
 
 googletest is a testing framework developed by the Testing Technology team with
-Google's specific requirements and constraints in mind. No matter whether you
-work on Linux, Windows, or a Mac, if you write C++ code, googletest can help
-you. And it supports *any* kind of tests, not just unit tests.
+Google's specific requirements and constraints in mind. Whether you work on
+Linux, Windows, or a Mac, if you write C++ code, googletest can help you. And it
+supports *any* kind of tests, not just unit tests.
 
 So what makes a good test, and how does googletest fit in? We believe:
 
@@ -21,7 +21,7 @@
     easy to maintain. Such consistency is especially helpful when people switch
     projects and start to work on a new code base.
 3.  Tests should be *portable* and *reusable*. Google has a lot of code that is
-    platform-neutral, its tests should also be platform-neutral. googletest
+    platform-neutral; its tests should also be platform-neutral. googletest
     works on different OSes, with different compilers, with or without
     exceptions, so googletest tests can work with a variety of configurations.
 4.  When tests fail, they should provide as much *information* about the problem
@@ -44,18 +44,17 @@
 
 ## Beware of the nomenclature
 
-_Note:_ There might be some confusion of idea due to different
-definitions of the terms _Test_, _Test Case_ and _Test Suite_, so beware
-of misunderstanding these.
+_Note:_ There might be some confusion arising from different definitions of the
+terms _Test_, _Test Case_ and _Test Suite_, so beware of misunderstanding these.
 
 Historically, googletest started to use the term _Test Case_ for grouping
-related tests, whereas current publications including the International Software
-Testing Qualifications Board ([ISTQB](http://www.istqb.org/)) and various
-textbooks on Software Quality use the term _[Test Suite][istqb test suite]_ for
-this.
+related tests, whereas current publications, including International Software
+Testing Qualifications Board ([ISTQB](http://www.istqb.org/)) materials and
+various textbooks on software quality, use the term
+_[Test Suite][istqb test suite]_ for this.
 
-The related term _Test_, as it is used in the googletest, is corresponding to
-the term _[Test Case][istqb test case]_ of ISTQB and others.
+The related term _Test_, as it is used in googletest, corresponds to the term
+_[Test Case][istqb test case]_ of ISTQB and others.
 
 The term _Test_ is commonly of broad enough sense, including ISTQB's definition
 of _Test Case_, so it's not much of a problem here. But the term _Test Case_ as
@@ -120,7 +119,7 @@
 this in mind if you get a heap checker error in addition to assertion errors.
 
 To provide a custom failure message, simply stream it into the macro using the
-`<<` operator, or a sequence of such operators. An example:
+`<<` operator or a sequence of such operators. An example:
 
 ```c++
 ASSERT_EQ(x.size(), y.size()) << "Vectors x and y are of unequal length";
@@ -166,16 +165,16 @@
 
 Value arguments must be comparable by the assertion's comparison operator or
 you'll get a compiler error. We used to require the arguments to support the
-`<<` operator for streaming to an `ostream`, but it's no longer necessary. If
+`<<` operator for streaming to an `ostream`, but this is no longer necessary. If
 `<<` is supported, it will be called to print the arguments when the assertion
 fails; otherwise googletest will attempt to print them in the best way it can.
-For more details and how to customize the printing of the arguments, see
-[documentation](../../googlemock/docs/cook_book.md#teaching-gmock-how-to-print-your-values)
+For more details and how to customize the printing of the arguments, see the
+[documentation](../../googlemock/docs/cook_book.md#teaching-gmock-how-to-print-your-values).
 
 These assertions can work with a user-defined type, but only if you define the
-corresponding comparison operator (e.g. `==`, `<`, etc). Since this is
-discouraged by the Google [C++ Style
-Guide](https://google.github.io/styleguide/cppguide.html#Operator_Overloading),
+corresponding comparison operator (e.g., `==` or `<`). Since this is discouraged
+by the Google
+[C++ Style Guide](https://google.github.io/styleguide/cppguide.html#Operator_Overloading),
 you may need to use `ASSERT_TRUE()` or `EXPECT_TRUE()` to assert the equality of
 two objects of a user-defined type.
 
@@ -185,8 +184,8 @@
 
 Arguments are always evaluated exactly once. Therefore, it's OK for the
 arguments to have side effects. However, as with any ordinary C/C++ function,
-the arguments' evaluation order is undefined (i.e. the compiler is free to
-choose any order) and your code should not depend on any particular argument
+the arguments' evaluation order is undefined (i.e., the compiler is free to
+choose any order), and your code should not depend on any particular argument
 evaluation order.
 
 `ASSERT_EQ()` does pointer equality on pointers. If used on two C strings, it
@@ -199,7 +198,7 @@
 
 When doing pointer comparisons use `*_EQ(ptr, nullptr)` and `*_NE(ptr, nullptr)`
 instead of `*_EQ(ptr, NULL)` and `*_NE(ptr, NULL)`. This is because `nullptr` is
-typed while `NULL` is not. See [FAQ](faq.md) for more details.
+typed, while `NULL` is not. See the [FAQ](faq.md) for more details.
 
 If you're working with floating point numbers, you may want to use the floating
 point variations of some of these macros in order to avoid problems caused by
@@ -246,7 +245,7 @@
 
 To create a test:
 
-1.  Use the `TEST()` macro to define and name a test function, These are
+1.  Use the `TEST()` macro to define and name a test function. These are
     ordinary C++ functions that don't return a value.
 2.  In this function, along with any valid C++ statements you want to include,
     use the various googletest assertions to check values.
@@ -263,7 +262,7 @@
 `TEST()` arguments go from general to specific. The *first* argument is the name
 of the test suite, and the *second* argument is the test's name within the test
 case. Both names must be valid C++ identifiers, and they should not contain
-underscore (`_`). A test's *full name* consists of its containing test suite and
+any underscores (`_`). A test's *full name* consists of its containing test suite and
 its individual name. Tests from different test suites can have the same
 individual name.
 
@@ -290,7 +289,7 @@
 }
 ```
 
-googletest groups the test results by test suites, so logically-related tests
+googletest groups the test results by test suites, so logically related tests
 should be in the same test suite; in other words, the first argument to their
 `TEST()` should be the same. In the above example, we have two tests,
 `HandlesZeroInput` and `HandlesPositiveInput`, that belong to the same test
@@ -305,18 +304,18 @@
 ## Test Fixtures: Using the Same Data Configuration for Multiple Tests {#same-data-multiple-tests}
 
 If you find yourself writing two or more tests that operate on similar data, you
-can use a *test fixture*. It allows you to reuse the same configuration of
+can use a *test fixture*. This allows you to reuse the same configuration of
 objects for several different tests.
 
 To create a fixture:
 
-1.  Derive a class from `::testing::Test` . Start its body with `protected:` as
+1.  Derive a class from `::testing::Test` . Start its body with `protected:`, as
     we'll want to access fixture members from sub-classes.
 2.  Inside the class, declare any objects you plan to use.
 3.  If necessary, write a default constructor or `SetUp()` function to prepare
     the objects for each test. A common mistake is to spell `SetUp()` as
     **`Setup()`** with a small `u` - Use `override` in C++11 to make sure you
-    spelled it correctly
+    spelled it correctly.
 4.  If necessary, write a destructor or `TearDown()` function to release any
     resources you allocated in `SetUp()` . To learn when you should use the
     constructor/destructor and when you should use `SetUp()/TearDown()`, read
@@ -344,9 +343,9 @@
 `TEST_F()`, or you'll get the compiler error "`virtual outside class
 declaration`".
 
-For each test defined with `TEST_F()` , googletest will create a *fresh* test
-fixture at runtime, immediately initialize it via `SetUp()` , run the test,
-clean up by calling `TearDown()` , and then delete the test fixture. Note that
+For each test defined with `TEST_F()`, googletest will create a *fresh* test
+fixture at runtime, immediately initialize it via `SetUp()`, run the test,
+clean up by calling `TearDown()`, and then delete the test fixture. Note that
 different tests in the same test suite have different test fixture objects, and
 googletest always deletes a test fixture before it creates the next one.
 googletest does **not** reuse the same test fixture for multiple tests. Any
@@ -424,9 +423,9 @@
 
 When these tests run, the following happens:
 
-1.  googletest constructs a `QueueTest` object (let's call it `t1` ).
-2.  `t1.SetUp()` initializes `t1` .
-3.  The first test ( `IsEmptyInitially` ) runs on `t1` .
+1.  googletest constructs a `QueueTest` object (let's call it `t1`).
+2.  `t1.SetUp()` initializes `t1`.
+3.  The first test (`IsEmptyInitially`) runs on `t1`.
 4.  `t1.TearDown()` cleans up after the test finishes.
 5.  `t1` is destructed.
 6.  The above steps are repeated on another `QueueTest` object, this time
@@ -440,14 +439,14 @@
 unlike with many other C++ testing frameworks, you don't have to re-list all
 your defined tests in order to run them.
 
-After defining your tests, you can run them with `RUN_ALL_TESTS()` , which
+After defining your tests, you can run them with `RUN_ALL_TESTS()`, which
 returns `0` if all the tests are successful, or `1` otherwise. Note that
-`RUN_ALL_TESTS()` runs *all tests* in your link unit -- they can be from
+`RUN_ALL_TESTS()` runs *all tests* in your link unit--they can be from
 different test suites, or even different source files.
 
 When invoked, the `RUN_ALL_TESTS()` macro:
 
-*   Saves the state of all googletest flags
+*   Saves the state of all googletest flags.
 
 *   Creates a test fixture object for the first test.
 
@@ -459,7 +458,7 @@
 
 *   Deletes the fixture.
 
-*   Restores the state of all googletest flags
+*   Restores the state of all googletest flags.
 
 *   Repeats the above steps for the next test, until all tests have run.
 
@@ -472,7 +471,7 @@
 > return the value of `RUN_ALL_TESTS()`.
 >
 > Also, you should call `RUN_ALL_TESTS()` only **once**. Calling it more than
-> once conflicts with some advanced googletest features (e.g. thread-safe
+> once conflicts with some advanced googletest features (e.g., thread-safe
 > [death tests](advanced.md#death-tests)) and thus is not supported.
 
 **Availability**: Linux, Windows, Mac.
@@ -480,7 +479,7 @@
 ## Writing the main() Function
 
 Write your own main() function, which should return the value of
-`RUN_ALL_TESTS()`
+`RUN_ALL_TESTS()`.
 
 You can start from this boilerplate:
 
@@ -544,14 +543,14 @@
 The `::testing::InitGoogleTest()` function parses the command line for
 googletest flags, and removes all recognized flags. This allows the user to
 control a test program's behavior via various flags, which we'll cover in
-[AdvancedGuide](advanced.md). You **must** call this function before calling
+the [AdvancedGuide](advanced.md). You **must** call this function before calling
 `RUN_ALL_TESTS()`, or the flags won't be properly initialized.
 
 On Windows, `InitGoogleTest()` also works with wide strings, so it can be used
 in programs compiled in `UNICODE` mode as well.
 
 But maybe you think that writing all those main() functions is too much work? We
-agree with you completely and that's why Google Test provides a basic
+agree with you completely, and that's why Google Test provides a basic
 implementation of main(). If it fits your needs, then just link your test with
 gtest\_main library and you are good to go.