diff --git a/xios_examples/context_test/Makefile b/xios_examples/context_test/Makefile
index 6316d37..e8677c3 100644
--- a/xios_examples/context_test/Makefile
+++ b/xios_examples/context_test/Makefile
@@ -7,10 +7,10 @@
 #
 # Environment Variables expected by this MakeFile:
 #
-# NETCDF_LIB_DIR: the directories for the netCDF lib files
+# NETCDF_LIBDIR: the directories for the netCDF lib files
 #                 encoded as a -L string, e.g.
 #                 "-L/dir1 -L/dir2"
-# NETCDF_INC_DIR: the directories for the netCDF include files
+# NETCDF_INCDIR: the directories for the netCDF include files
 #                 encoded as a -I string, e.g.
 #                 "-I/dir3 -I/dir4"
 #     (note, this is for consistency with the XIOS build process