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diff --git a/modules/qmk/flow_rgb_matrix_effect/rgb_matrix_module.inc b/modules/qmk/flow_rgb_matrix_effect/rgb_matrix_module.inc
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+// Copyright 2024-2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+RGB_MATRIX_EFFECT(FLOW)
+
+#ifdef RGB_MATRIX_CUSTOM_EFFECT_IMPLS
+
+// "Flow" animated effect. Draws moving wave patterns mimicking the appearance
+// of flowing liquid. For interesting variety of patterns, space coordinates are
+// slowly rotated and a function of several sine waves is evaluated.
+static bool FLOW(effect_params_t* params) {
+ RGB_MATRIX_USE_LIMITS(led_min, led_max);
+
+ static uint16_t wrap_correction = 0;
+ static uint8_t last_high_byte = 0;
+ const uint8_t time_scale = 1 + rgb_matrix_config.speed / 8;
+ const uint8_t high_byte = (uint8_t)(g_rgb_timer >> 16);
+ if (last_high_byte != high_byte) {
+ last_high_byte = high_byte;
+ wrap_correction += ((uint16_t)time_scale) << 8;
+ }
+ const uint16_t time = scale16by8(g_rgb_timer, time_scale) + wrap_correction;
+
+ // Compute rotation coefficients with 7 fractional bits.
+ const int8_t rot_c = cos8(time / 4) - 128;
+ const int8_t rot_s = sin8(time / 4) - 128;
+ const uint8_t omega = 32 + sin8(time) / 4;
+
+ for (uint8_t i = led_min; i < led_max; ++i) {
+ RGB_MATRIX_TEST_LED_FLAGS();
+ const uint8_t x = g_led_config.point[i].x;
+ const uint8_t y = g_led_config.point[i].y;
+
+ // Rotate (x, y) by the 2x2 rotation matrix described by rot_c, rot_s.
+ const uint8_t x1 = (uint8_t)((((int16_t)rot_c) * ((int16_t)x)) / 128) - (uint8_t)((((int16_t)rot_s) * ((int16_t)y)) / 128);
+ const uint8_t y1 = (uint8_t)((((int16_t)rot_s) * ((int16_t)x)) / 128) + (uint8_t)((((int16_t)rot_c) * ((int16_t)y)) / 128);
+
+ uint8_t value = scale8(sin8(x1 - 2 * time), omega) + y1 + time / 4;
+ value = (value <= 127) ? value : (255 - value);
+
+ hsv_t hsv = rgb_matrix_config.hsv;
+ hsv.h -= value / 4;
+ hsv.s = scale8(hsv.s, (value < 74) ? 255 : (549 - 4 * value));
+ hsv.v = scale8(hsv.v, (value < 95) ? (64 + 2 * value) : 255);
+
+ rgb_t rgb = rgb_matrix_hsv_to_rgb(hsv);
+ rgb_matrix_set_color(i, rgb.r, rgb.g, rgb.b);
+ }
+
+ return rgb_matrix_check_finished_leds(led_max);
+}
+
+#endif // RGB_MATRIX_CUSTOM_EFFECT_IMPLS