diff --git a/salt-formula-manager.py b/salt-formula-manager.py
index 5ac00f3..a73857f 100644
--- a/salt-formula-manager.py
+++ b/salt-formula-manager.py
@@ -57,6 +57,14 @@ def get_formulas(conf):
             # clone git repo
             Repo.clone_from(git_url, local_path)
 
+# purge un-managed formulas
+def clean_formulas(conf):
+    if conf['purge_formulas']:
+        print('Cleaning out unmanaged formulas')
+        
+    else:
+        print('Not cleaning out unmanaged formulas')
+
 # main program
 def main():
     # read configuration settings
@@ -68,5 +76,8 @@ def main():
     # do the formula stuff
     get_formulas(conf)
 
+    # clean unmanaged formulas
+    clean_formulas(conf)
+
 # run main
 main()
diff --git a/sfm.yaml.example b/sfm.yaml.example
index 637c1ce..27652ae 100644
--- a/sfm.yaml.example
+++ b/sfm.yaml.example
@@ -6,6 +6,9 @@ formulas_url: https://github.com/saltstack-formulas/
 # where to store the new formulas (relative to current directory)
 formulas_dir: formulas
 
+# remove unmanaged formulas
+purge_formulas: true
+
 # list of formulas to import
 formulas:
   - vim