diff --git a/mathgenerator/funcs/__init__.py b/mathgenerator/funcs/__init__.py
index 575dcd2..c49269f 100644
--- a/mathgenerator/funcs/__init__.py
+++ b/mathgenerator/funcs/__init__.py
@@ -111,3 +111,4 @@ from .decimal_to_bcd import *
 from .circumference import *
 from .combine_like_terms import *
 from .conditional_probability import *
+from .signum_function import *