1 files changed, 1 insertions, 0 deletions
diff --git a/src/math.h b/src/math.h
index 7e65047..42d7304 100644
--- a/src/math.h
+++ b/src/math.h
@@ -18,5 +18,6 @@ c3_group_rot_t *get_group_rotation(char *id);
 radians d2r(degrees d);
 degrees r2d(radians r);
 radians points_to_angle(c2_t p1,c2_t p2);
+int between_angles(degrees d,real lower,real upper);
 
 #endif