add missing period

googletest/docs/primer.md

@@ -65,7 +65,7 @@ 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
 was used in Google Test is of contradictory sense and thus confusing.
 
-googletest recently started replacing the term _Test Case_ by _Test Suite_ The
+googletest recently started replacing the term _Test Case_ by _Test Suite_. The
 preferred API is TestSuite*. The older TestCase* API is being slowly deprecated
 and refactored away