diff --git a/tox.ini b/tox.ini
index fda98dd6..cd095583 100644
--- a/tox.ini
+++ b/tox.ini
@@ -25,7 +25,7 @@ coverage_exclude_paths = "wwpdb/__init__.py,wwpdb/utils/tests-nmr/test-output/*"
 coverage_cutoff = 20
 #
 # Comma list of directories to exclude from flake
-flake_exclude_paths = --exclude wwpdb/utils/tests-nmr/test-output,wwpdb/utils/nmr/obsolete,wwpdb/utils/nmr/mr/*PT*.py,wwpdb/utils/nmr/mr/*MR*.py --per-file-ignores='wwpdb/utils/nmr/NmrDpUtility.py:E501,E741'
+flake_exclude_paths = --exclude wwpdb/utils/tests-nmr/test-output,wwpdb/utils/nmr/obsolete,wwpdb/utils/nmr/mr/*PT*.py,wwpdb/utils/nmr/mr/*MR*.py,wwpdb/utils/nmr/mr/*CRD*.py --per-file-ignores='wwpdb/utils/nmr/NmrDpUtility.py:E501,E741'
 
 # Pylint exclusions - comma separated
 pylint_exclude_paths = --ignore wwpdb/utils/nmr/mr
@@ -142,4 +142,4 @@ commands =
     echo " ------- Building {envname} reports ----------"
     coverage report --fail-under={[local_settings]coverage_cutoff}
     - coverage xml
-    echo "Completed {envname}"
\ No newline at end of file
+    echo "Completed {envname}"