fixed typo

cmake/README.md

diff --git a/cmake/README.md b/cmake/README.md
index 96aaf4f..55b40c5 100644
--- a/cmake/README.md
+++ b/cmake/README.md
@@ -131,7 +131,7 @@
 you need to add *cmake* command argument `-Dprotobuf_BUILD_TESTS=OFF` to disable testing.
 
 To make a *Visual Studio* file for Visual Studio 15 2017, create the *Visual Studio*
-solution file above and edit the CmakeCache file.
+solution file above and edit the CMakeCache file.
 
 	C:Path\to\protobuf\cmake\build\solution\CMakeCache