diff --git a/sensor_msgs/include/sensor_msgs/distortion_models.h b/sensor_msgs/include/sensor_msgs/distortion_models.h
index a4c6c901..a859160f 100644
--- a/sensor_msgs/include/sensor_msgs/distortion_models.h
+++ b/sensor_msgs/include/sensor_msgs/distortion_models.h
@@ -45,6 +45,7 @@ namespace sensor_msgs
     const std::string PLUMB_BOB = "plumb_bob";
     const std::string RATIONAL_POLYNOMIAL = "rational_polynomial";
     const std::string EQUIDISTANT = "equidistant";
+    const std::string FISHEYE = "fisheye"; // Kannala-Brandt radial distortion model (theta: real angle, theta_d:distorted angle) θ_d=θ*(1+k1*θ^2+k2*θ^4+k3*θ^6+k4*θ^8) . As in https://docs.opencv.org/master/db/d58/group__calib3d__fisheye.html
   }
 }