diff --git a/cython/python_solvespace/slvs.pyi b/cython/python_solvespace/slvs.pyi
index 8c2f05f8..2d576b41 100644
--- a/cython/python_solvespace/slvs.pyi
+++ b/cython/python_solvespace/slvs.pyi
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from typing import Tuple, List, Sequence, Counter, ClassVar
+from enum import IntEnum, auto
 
 def quaternion_u(
     qw: float,
@@ -36,6 +37,51 @@ def make_quaternion(
 ) -> Tuple[float, float, float, float]:
     ...
 
+class Constraint(IntEnum):
+    """Symbol of the constraint types."""
+    POINTS_COINCIDENT = 100000
+    PT_PT_DISTANCE = auto()
+    PT_PLANE_DISTANCE = auto()
+    PT_LINE_DISTANCE = auto()
+    PT_FACE_DISTANCE = auto()
+    PT_IN_PLANE = auto()
+    PT_ON_LINE = auto()
+    PT_ON_FACE = auto()
+    EQUAL_LENGTH_LINES = auto()
+    LENGTH_RATIO = auto()
+    EQ_LEN_PT_LINE_D = auto()
+    EQ_PT_LN_DISTANCES = auto()
+    EQUAL_ANGLE = auto()
+    EQUAL_LINE_ARC_LEN = auto()
+    SYMMETRIC = auto()
+    SYMMETRIC_HORIZ = auto()
+    SYMMETRIC_VERT = auto()
+    SYMMETRIC_LINE = auto()
+    AT_MIDPOINT = auto()
+    HORIZONTAL = auto()
+    VERTICAL = auto()
+    DIAMETER = auto()
+    PT_ON_CIRCLE = auto()
+    SAME_ORIENTATION = auto()
+    ANGLE = auto()
+    PARALLEL = auto()
+    PERPENDICULAR = auto()
+    ARC_LINE_TANGENT = auto()
+    CUBIC_LINE_TANGENT = auto()
+    EQUAL_RADIUS = auto()
+    PROJ_PT_DISTANCE = auto()
+    WHERE_DRAGGED = auto()
+    CURVE_CURVE_TANGENT = auto()
+    LENGTH_DIFFERENCE = auto()
+
+
+class ResultFlag(IntEnum):
+    """Symbol of the result flags."""
+    OKAY = 0
+    INCONSISTENT = auto()
+    DIDNT_CONVERGE = auto()
+    TOO_MANY_UNKNOWNS = auto()
+
 class Params:
     pass