diff --git a/docs/building-examples.rst b/docs/building-examples.rst
index c15734d..af3abae 100644
--- a/docs/building-examples.rst
+++ b/docs/building-examples.rst
@@ -20,14 +20,14 @@ Select your FPGA family:
       .. code-block:: bash
          :name: fpga-fam-xc7
 
-         FPGA_FAM="xc7"
+         export FPGA_FAM="xc7"
 
    .. group-tab:: EOS S3
 
       .. code-block:: bash
          :name: fpga-fam-eos-s3
 
-         FPGA_FAM="eos-s3"
+         export FPGA_FAM="eos-s3"
 
 Next, prepare the environment:
 
diff --git a/eos-s3/btn_counter/README.rst b/eos-s3/btn_counter/README.rst
index 595017e..da0bef0 100644
--- a/eos-s3/btn_counter/README.rst
+++ b/eos-s3/btn_counter/README.rst
@@ -7,6 +7,4 @@ counter example, run the following command:
 .. code-block:: bash
    :name: eos-s3-counter
 
-   #FIXME: make sure FPGA_FAM is available and remove env var export
-   export FPGA_FAM=eos-s3
    make -C btn_counter