diff --git a/client/src/components/Graph.vue b/client/src/components/Graph.vue
index 151bf6b..e2e71cb 100644
--- a/client/src/components/Graph.vue
+++ b/client/src/components/Graph.vue
@@ -147,6 +147,7 @@ async function _deleteSegment(from: number, to: number): Promise<number> {
   }
 }
 
+
 // TODO: convert to class component
 export default defineComponent({
   name: 'Graph',
@@ -211,10 +212,19 @@ export default defineComponent({
         this.pod = new AnomalyPod(
           document.getElementById('chart'),
           resolveDataAnomaly.bind(this),
+          this.setSeasonality.bind(this),
           sa
         );
       }
       this.pod.render();
+    },
+    setSeasonality(from: number, to: number) {
+      let cfg = _.clone(this.analyticUnitConfig);
+      // TODO: get 10 (step) from API config
+      cfg.seasonality = Math.ceil(Math.abs(from - to) / 10) * 10;
+      console.log("cfg.seasonality: " + cfg.seasonality);
+      
+      this.$store.dispatch('patchConfig',  { Anomaly: cfg });
     }
   },
   computed: {
diff --git a/client/src/components/pods/anomaly_pod.ts b/client/src/components/pods/anomaly_pod.ts
index bd76470..0c080c9 100644
--- a/client/src/components/pods/anomaly_pod.ts
+++ b/client/src/components/pods/anomaly_pod.ts
@@ -5,6 +5,8 @@ import { Segment } from "@/types/segment";
 import { LineTimeSerie } from '@chartwerk/line-pod';
 import { SegmentsSet } from '@/types/segment_set';
 
+import * as _ from 'lodash';
+
 
 export type UpdateDataCallback = (range: TimeRange) => Promise<{
   timeserie: LineTimeSerie[],
@@ -12,22 +14,84 @@ export type UpdateDataCallback = (range: TimeRange) => Promise<{
   segments: Segment[]
 }>;
 
-import * as _ from 'lodash';
+export type SetSeasonalityCallback = (from: number, to: number) => void;
 
 
 export class AnomalyPod extends HasticPod<UpdateDataCallback> {
 
+  private _ssc: SetSeasonalityCallback;
+
   private _hsr: AnomalyHSR;
 
+  private _zKeyIsDown: boolean;
+
+  private _labelSeasonality: boolean;
+
   constructor(
     el: HTMLElement,
     udc: UpdateDataCallback,
+    ssc: SetSeasonalityCallback,
     segmentSet: SegmentsSet<Segment>
   ) {
-    super(el, udc, segmentSet)
+    super(el, udc, segmentSet);
+    this._zKeyIsDown = false;
+    this._ssc = ssc;
+
+    window.addEventListener("keydown", e => {
+      if(e.code == "KeyZ") {
+        this._zKeyIsDown = true;
+      }
+    });
+
+    window.addEventListener("keyup", (e) => {
+      if(e.code == "KeyZ") {
+        this._zKeyIsDown = false;
+      }
+    });
+
     this.fetchData();
   }
 
+  protected onBrushStart(): void {
+    if(this._zKeyIsDown) {
+      this._labelSeasonality = true;
+      this.svg.select('.selection')
+        .attr('fill', 'orange');
+    }
+
+    // TODO: move to state
+    this.isBrushing === true;
+    const selection = this.d3.event.selection;
+    if(selection !== null && selection.length > 0) {
+      this.brushStartSelection = this.d3.event.selection[0];
+    }
+    this.onMouseOut();
+  }
+
+  protected onBrushEnd(): void {
+    console.log("END");
+    if(!this._labelSeasonality) {
+      super.onBrushEnd();
+    } else {
+      const extent = this.d3.event.selection;
+      this.isBrushing === false;
+      if(extent === undefined || extent === null || extent.length < 2) {
+        return;
+      }
+      this.chartContainer
+        .call(this.brush.move, null);
+
+      const startTimestamp = this.xScale.invert(extent[0]);
+      const endTimestamp = this.xScale.invert(extent[1]);
+
+      if(this._labelSeasonality) {
+        this._ssc(startTimestamp, endTimestamp);
+        this._labelSeasonality = false;
+      }
+    }
+  }
+
+
   public fetchData(): void {
     let to = Math.floor(Date.now() / 1000);
     let from = to - 50000; // -50000 seconds
@@ -76,9 +140,7 @@ export class AnomalyPod extends HasticPod<UpdateDataCallback> {
       .attr('pointer-events', 'none')
       .attr('points', points);
 
-    // render timestamp
-
-
+    // seasonality grid
     let ts = this._hsr.timestamp;
     this._renderHSRGridLine(ts, true);
     ts -= this._hsr.seasonality;
diff --git a/client/src/components/pods/hastic_pod.ts b/client/src/components/pods/hastic_pod.ts
index 5572f9a..c209dce 100644
--- a/client/src/components/pods/hastic_pod.ts
+++ b/client/src/components/pods/hastic_pod.ts
@@ -92,9 +92,6 @@ export abstract class HasticPod<T> extends LinePod {
   }
 
   protected async updateRange(range: AxisRange[]) {
-    // in assumption that range have been changed
-    console.log('update range.....');
-    console.log(range)
     this.fetchData();
   }
 
diff --git a/client/src/components/pods/pattern_pod.ts b/client/src/components/pods/pattern_pod.ts
index 4ae40d0..0aa1f9a 100644
--- a/client/src/components/pods/pattern_pod.ts
+++ b/client/src/components/pods/pattern_pod.ts
@@ -114,7 +114,7 @@ export class PatternPod extends HasticPod<UpdateDataCallback> {
     this.onMouseOut();
   }
 
-  protected onBrushEnd(): void {
+  protected onBrushEnd(): void {    
     if(!this._labelBrush && !this._antiLabelBrush && !this._deleteBrush) {
       super.onBrushEnd();
     } else {
diff --git a/client/src/services/analytics.service.ts b/client/src/services/analytics.service.ts
index 2a08aa3..03ccc13 100644
--- a/client/src/services/analytics.service.ts
+++ b/client/src/services/analytics.service.ts
@@ -8,7 +8,7 @@ import { getGenerator } from '@/utils';
 import _ from 'lodash';
 import { 
   AnalyticUnitType, AnlyticUnitConfig,
-  PatternConfig, ThresholdConfig, AnomalyConfig 
+  PatternConfig, ThresholdConfig, AnomalyConfig
 } from "@/types/analytic_units";
 import { AnomalyHSR } from "@/types";
 
diff --git a/client/src/views/Home.vue b/client/src/views/Home.vue
index 8f2ea92..fe2989d 100644
--- a/client/src/views/Home.vue
+++ b/client/src/views/Home.vue
@@ -19,7 +19,7 @@
       <div v-if="analyticUnitType == analyticUnitTypes[1]">
         Hold <pre>S</pre> to label patterns; 
         Hold <pre>A</pre> to label anti patterns <br/>
-        Holde key <pre>D</pre> to delete patterns
+        Hold <pre>D</pre> to delete patterns
         <br/>
         <hr/>
         Correlation score:
@@ -33,8 +33,10 @@
         <button @click="clearAllLabeling"> clear all labeling </button>
       </div>
       <div v-if="analyticUnitType == analyticUnitTypes[2]">
-        Alpha: 
-        <input :value="analyticUnitConfig.alpha" @change="alphaChange" /> <br/>
+        Hold <pre>Z</pre> to set seasonality timespan
+        <hr/>
+        <!-- Alpha: 
+        <input :value="analyticUnitConfig.alpha" @change="alphaChange" /> <br/> -->
         Confidence:
         <input :value="analyticUnitConfig.confidence" @change="confidenceChange" /> <br/>
         Seasonality: