CMake HDF5_ROOT doc [skip ci]

scivision · web-flow · commit c23f89c8db56 · 2019-06-26T08:38:37.000-04:00
diff --git a/README.md b/README.md
@@ -67,11 +67,14 @@ cd build
 
 ctest -V
 ```
+
 If you need to specify a particular HDF5 library, use
 ```sh
 cmake -DHDF5_ROOT=/path/to/hdf5lib -B build
 ```
 
+or set environment variable `HDF5_ROOT=/path/to/hdf5lib`
+
 ## Usage
 
 All examples assume:
