diff --git a/src/main/py/read_math_function.py b/src/main/py/read_math_function.py
index 13fb78c..b372c44 100644
--- a/src/main/py/read_math_function.py
+++ b/src/main/py/read_math_function.py
@@ -23,6 +23,8 @@ def read_math_function():
                 simplified = simplify_exponential_function(type, function)
             elif type == "se":
                 simplified = sum_of_simplified_exponential_functions(type, function)
+            elif type == "de":
+                simplified = difference_of_simplified_exponential_functions(type, function)
             if not simplified:
                 print(
                     "Die eingegebene Funktion war ungültig, entspricht nicht der vorgegebenen Syntax"