Update README to include instruction to fetch git tags

Also, slight reformatting.

Change-Id: I7c35343556e48cadccd266b41465fb5ea04ace29

README.md

@@ -4,11 +4,15 @@ ROCm Application for Reporting System Info
 ## To Build
 Use the standard cmake build procedure to build rocminfo. The location of ROCM
 root (parent directory containing ROCM headers and libraries) must be provided
-as a cmake argument using the standard CMAKE_PREFIX_PATH cmake variable. Building
-the package also requires the rocm-cmake helper files.
+as a cmake argument using the standard CMAKE_PREFIX_PATH cmake variable.
 
-For example, building from the CMakeLists.txt directory
-might look like this:
+After cloning the rocminfo git repo, please make sure to do a git-fetch --tags
+to get the tags residing on the repo. These tags are used for versioning.
+For example,
+
+$ git fetch --tags origin
+
+Building from the CMakeLists.txt directory might look like this:
 
 mkdir -p build
 
@@ -20,6 +24,6 @@ make
 
 cd ..
 
-
-Upon a successful build the binary, rocminfo, and the python script, rocm_agent_enumerator, will be in the build folder.
+Upon a successful build the binary, rocminfo, and the python script,
+rocm_agent_enumerator, will be in the build folder.