diff --git a/Dockerfile b/Dockerfile
index 1cb63bafcf2fccdb07143e0a64f501573ef57ac8..0dfa24396ed9ab041d6c6dd3aab02bc73dff01e4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,12 @@
 # This image creates a common scientific build environment that includes:
 # gfortran, hdf4, hdf5, netcdf4
+
+# NOTE: nbearson/gfortran is a modified version of the official
+# docker gcc image that includes 6.1 support. Now that the official
+# image includes fortran, this line should change once a new build
+# of the gcc image is pushed to dockerhub.
+# to...
+# FROM gcc
 FROM nbearson/gfortran
 
 ENV ZLIB_VERSION 1.2.8