diff --git a/res/lottie/extensions/slot1.json b/res/lottie/extensions/slot1.json
index f41fb08..aa7ffd3 100644
--- a/res/lottie/extensions/slot1.json
+++ b/res/lottie/extensions/slot1.json
@@ -1 +1 @@
-{"v":"4.8.0","meta":{"g":"LottieFiles AE 3.0.2","a":"","k":"","d":"","tc":""},"fr":60,"ip":0,"op":121,"w":550,"h":550,"nm":"C","assets":[],"layers":[{"ind":1,"ty":4,"nm":"S","sr":1,"ks":{"o":{"a":0,"k":100},"r":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"t":0,"s":[0]},{"t":120,"s":[360]}]},"p":{"a":0,"k":[275,275,0]},"a":{"a":0,"k":[-7.886,88.719,0]},"s":{"a":0,"k":[100,100,100]}},"ao":0,"shapes":[{"ty":"gr","it":[{"ty":"rc","d":1,"s":{"a":0,"k":[282.019,134.888]},"p":{"a":0,"k":[0,0]},"r":{"a":0,"k":0},"nm":"R"},{"ty":"st","c":{"a":0,"k":[0.991,0,1,1]},"o":{"a":0,"k":100},"w":{"a":0,"k":3},"lc":1,"lj":1,"ml":4,"nm":"S"},{"ty":"gf","o":{"a":0,"k":100},"r":1,"g":{"p":9,"k":{"a":0,"k":[0,0.514,0.373,0.984,0.141,0.478,0.412,0.984,0.283,0.443,0.451,0.984,0.379,0.408,0.49,0.984,0.475,0.373,0.529,0.984,0.606,0.278,0.647,0.925,0.737,0.184,0.765,0.867,0.868,0.092,0.882,0.808,1,0,1,0.749]},"sid":"gradient_fill"},"s":{"a":0,"k":[-159.51,23.531]},"e":{"a":0,"k":[183.084,8.059]},"t":1,"nm":"G"},{"ty":"tr","p":{"a":0,"k":[-7.886,88.719]},"a":{"a":0,"k":[0,0]},"s":{"a":0,"k":[100,100]},"r":{"a":0,"k":0},"o":{"a":0,"k":100},"sk":{"a":0,"k":0},"sa":{"a":0,"k":0},"nm":"T"}],"nm":"R"}],"ip":0,"op":300,"st":0}],"markers":[]}
\ No newline at end of file
+{"v":"4.8.0","meta":{"g":"LottieFiles AE 3.0.2","a":"","k":"","d":"","tc":""},"fr":60,"ip":0,"op":121,"w":550,"h":550,"nm":"C","assets":[],"layers":[{"ind":1,"ty":4,"nm":"S","sr":1,"ks":{"o":{"a":0,"k":100},"r":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"t":0,"s":[0]},{"t":120,"s":[360]}]},"p":{"a":0,"k":[275,275,0]},"a":{"a":0,"k":[0,0,0]},"s":{"a":0,"k":[100,100,100]}},"ao":0,"shapes":[{"ty":"gr","nm":"R","it":[{"ty":"rc","d":1,"s":{"a":0,"k":[282.019,134.888]},"p":{"a":0,"k":[0,0]},"r":{"a":0,"k":0},"nm":"R"},{"ty":"st","c":{"a":0,"k":[0.991,0,1,1]},"o":{"a":0,"k":100},"w":{"a":0,"k":3},"lc":1,"lj":1,"ml":4,"nm":"S"},{"ty":"gf","nm":"G","r":1,"t":2,"o":{"a":0,"k":100,"sid":"gradient_opacity"},"g":{"p":9,"k":{"a":0,"k":[0,0.514,0.373,0.984,0.141,0.478,0.412,0.984,0.283,0.443,0.451,0.984,0.379,0.408,0.49,0.984,0.475,0.373,0.529,0.984,0.606,0.278,0.647,0.925,0.737,0.184,0.765,0.867,0.868,0.092,0.882,0.808,1,0,1,0.749]},"sid":"gradient_fill"},"s":{"a":0,"k":[0,0],"sid":"gradient_start"},"e":{"a":0,"k":[90,0],"sid":"gradient_end"},"h":{"a":0,"k":0,"sid":"gradient_height"},"a":{"a":0,"k":0,"sid":"gradient_angle"}},{"ty":"tr","p":{"a":0,"k":[0,0]},"a":{"a":0,"k":[0,0]},"s":{"a":0,"k":[100,100]},"r":{"a":0,"k":0},"o":{"a":0,"k":100},"sk":{"a":0,"k":0},"sa":{"a":0,"k":0},"nm":"T"}]}],"ip":0,"op":300,"st":0}],"markers":[]}
\ No newline at end of file
diff --git a/src/LottieSlot.cpp b/src/LottieSlot.cpp
index f1ff0bf..a1cc0e2 100644
--- a/src/LottieSlot.cpp
+++ b/src/LottieSlot.cpp
@@ -81,13 +81,20 @@ struct UserExample : tvgexam::Example
             slots.push_back(std::move(slot));
         }
 
-        //slot (gradient)
+        //slot (gradient: color stops, opacity, start, end, height, angle)
         {
             auto slot = std::unique_ptr<tvg::LottieAnimation>(tvg::LottieAnimation::gen());
             auto picture = slot->picture();
             if (!tvgexam::verify(picture->load(EXAMPLE_DIR"/lottie/extensions/slot1.json"))) return false;
 
-            const char* slotJson = R"({"gradient_fill":{"p":{"p":2,"k":{"k":[0,0.1,0.1,0.2,1,1,0.1,0.2,0,0,1,1]}}}})";
+            const char* slotJson = R"({
+                "gradient_fill":{"p":{"p":2,"k":{"k":[0,0.1,0.1,0.2,1,1,0.1,0.2,0,0,1,1]}}},
+                "gradient_opacity":{"p":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[100],"t":0},{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[30],"t":60},{"s":[100],"t":120}]}},
+                "gradient_start":{"p":{"a":1,"k":[{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"s":[-80,-40],"t":0},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"s":[80,40],"t":60},{"s":[-80,-40],"t":120}]}},
+                "gradient_end":{"p":{"a":0,"k":[110,0]}},
+                "gradient_height":{"p":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[0],"t":0},{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[90],"t":60},{"s":[0],"t":120}]}},
+                "gradient_angle":{"p":{"a":1,"k":[{"i":{"x":[0.833],"y":[0.833]},"o":{"x":[0.167],"y":[0.167]},"s":[0],"t":0},{"s":[360],"t":120}]}}
+            })";
             auto slotId = slot->gen(slotJson);
             if (!tvgexam::verify(slot->apply(slotId))) return false;