diff --git a/frappe/database/schema.py b/frappe/database/schema.py
index 9bd0a1e45b..d29bff1615 100644
--- a/frappe/database/schema.py
+++ b/frappe/database/schema.py
@@ -5,7 +5,7 @@ from frappe import _
 from frappe.utils import cint, cstr, flt
 from frappe.utils.defaults import get_not_null_defaults
 
-# This matches anything that isn't [a-zA-Z0-9_]
+# This matches anything that isn't Unicode Word Characters, Numbers and Underscore.
 SPECIAL_CHAR_PATTERN = re.compile(r"[\W]", flags=re.UNICODE)
 
 VARCHAR_CAST_PATTERN = re.compile(r"varchar\(([\d]+)\)")