diff --git a/preprocessor.py b/preprocessor.py
index f1a5e73aac1aa7737c4f233a35199d497c21fbc2..539a566a8871483c45d4455a6470548a7ce0bd48 100644
--- a/preprocessor.py
+++ b/preprocessor.py
@@ -31,6 +31,12 @@ def disambiguateUnits():
 def addMissingUnits():
     pass
 
+# Rather than using numbers, sometimes they're represented as special characters such as 1/2
+# Convert them to normal numbers
+def specialChars():
+    # eg \u00bd should become 1/2
+    pass
+
 # Check that everything in the database conforms to the schema
 def validateSchema():
     # for each json file in database/