diff --git a/README.md b/README.md
index 8434897..540010d 100644
--- a/README.md
+++ b/README.md
@@ -66,7 +66,7 @@ export interface IReactiveCollection<T> {
 
 For each call to *requestLength()* the observable *length$* must emit the collection's length. 
 
-For each call to *requestItem()* the observable *requestItem$* must emit the collection's item at the 'index' position (zero based). 
+For each call to *requestItem()* the observable *requestItem$* must emit the collection's *item* at the *index* position (zero based). 
 
 For each call to *reset()* the collection must clean its internal state and the observable *reset$* must emit some boolean (its value is not used). The virtual repeat library will request the data again. 
 
@@ -93,4 +93,4 @@ See <a href="https://gerardcarbo.github.io/virtual-repeat-angular/" target="_bla
 
 # Acknowledgements
 
-Derived from previous work of <a href="https://nya.io/uncategorized/make-a-list-view-in-angular/">Bob Yuan</a> but using a offsetter div instead of absolute item positioning. Revamped also to support asynch and reactive collections, and variable height rows.
+Derived from previous work of <a href="https://nya.io/uncategorized/make-a-list-view-in-angular/">Bob Yuan</a> but using an offsetter div instead of absolute item positioning. Revamped also to support asynch and reactive collections, and variable height rows.
diff --git a/package-lock.json b/package-lock.json
index 386e625..2c1ca7e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "virtual-repeat-angular-lib-app",
-  "version": "0.4.1",
+  "version": "0.4.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -15,17 +15,17 @@
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+      "version": "0.13.8",
+      "resolved": "https://registry.npmjs.org/@angular-devkit/build-angular/-/build-angular-0.13.8.tgz",
+      "integrity": "sha512-uRb8CKC0hUdcE+Fv2Ov9LJNelyjsiMuddBpo8pdTKCIHVVC6hvip9S/Z18Tvb207kKI3k7Dn+Ji1J63mCqmQzA==",
       "dev": true,
       "requires": {
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-        "@angular-devkit/build-optimizer": "0.13.1",
-        "@angular-devkit/build-webpack": "0.13.1",
-        "@angular-devkit/core": "7.3.1",
-        "@ngtools/webpack": "7.3.1",
-        "ajv": "6.7.0",
+        "@angular-devkit/architect": "0.13.8",
+        "@angular-devkit/build-optimizer": "0.13.8",
+        "@angular-devkit/build-webpack": "0.13.8",
+        "@angular-devkit/core": "7.3.8",
+        "@ngtools/webpack": "7.3.8",
+        "ajv": "6.9.1",
         "autoprefixer": "9.4.6",
         "circular-dependency-plugin": "5.0.2",
         "clean-css": "4.2.1",
@@ -41,7 +41,7 @@
         "mini-css-extract-plugin": "0.5.0",
         "minimatch": "3.0.4",
         "node-sass": "4.11.0",
-        "opn": "5.4.0",
+        "open": "6.0.0",
         "parse5": "4.0.0",
         "postcss": "7.0.14",
         "postcss-import": "12.0.1",
@@ -52,7 +52,7 @@
         "semver": "5.6.0",
         "source-map-loader": "0.2.4",
         "source-map-support": "0.5.10",
-        "speed-measure-webpack-plugin": "1.3.0",
+        "speed-measure-webpack-plugin": "1.3.1",
         "stats-webpack-plugin": "0.7.0",
         "style-loader": "0.23.1",
         "stylus": "0.54.5",
@@ -65,6 +65,43 @@
         "webpack-merge": "4.2.1",
         "webpack-sources": "1.3.0",
         "webpack-subresource-integrity": "1.1.0-rc.6"
+      },
+      "dependencies": {
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+          "dev": true,
+          "requires": {
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+          "resolved": "https://registry.npmjs.org/@angular-devkit/core/-/core-7.3.8.tgz",
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+          "dev": true,
+          "requires": {
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+            "chokidar": "2.0.4",
+            "fast-json-stable-stringify": "2.0.0",
+            "rxjs": "6.3.3",
+            "source-map": "0.7.3"
+          }
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+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
+        }
       }
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@@ -80,9 +117,9 @@
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@@ -100,14 +137,51 @@
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+        "@angular-devkit/architect": "0.13.8",
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+          "dev": true,
+          "requires": {
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+            "chokidar": "2.0.4",
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+          }
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@@ -203,42 +277,6 @@
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@@ -288,63 +329,12 @@
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@@ -465,6 +440,12 @@
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@@ -11714,13 +11342,15 @@
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
           "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "y18n": {
           "version": "3.2.1",
           "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
           "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -11729,6 +11359,7 @@
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-5.0.0.tgz",
       "integrity": "sha1-J17PDX/+Bcd+ZOfIbkzZS/DhIoo=",
       "dev": true,
+      "optional": true,
       "requires": {
         "camelcase": "^3.0.0"
       },
@@ -11737,7 +11368,8 @@
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
           "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
diff --git a/package.json b/package.json
index dbf673b..c95fda2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "virtual-repeat-angular-lib-app",
-  "version": "0.4.5",
+  "version": "0.4.6",
   "scripts": {
     "serve": "ng serve",
     "build_prod": "ng build --prod",
@@ -11,10 +11,10 @@
     "build_lib": "ng build --prod virtual-repeat-angular-lib",
     "npm_pack": "cp README.md dist/virtual-repeat-angular-lib && cd dist/virtual-repeat-angular-lib && npm pack && cp *.tgz ../releases/",
     "npm_build_and_package": "npm run build_lib && npm run npm_pack",
-    "npm_publish": "npm publish dist/virtual-repeat-angular-lib/virtual-repeat-angular-0.4.5.tgz",
+    "npm_publish": "npm publish dist/virtual-repeat-angular-lib/virtual-repeat-angular-0.4.6.tgz",
     "ngh_publish": "npm run build_lib && ng build --prod --base-href https://gerardcarbo.github.io/virtual-repeat-angular/ && ngh --dir dist/virtual-repeat-angular-lib-app",
-    "git_push": "git push -u origin master",
-    "git_push_force": "git push -u -f origin master",
+    "git_push": "git push origin master",
+    "git_push_force": "git push -f origin master",
     "git_ammend": "git commit --amend --all --no-edit",
     "git_pull": "git pull --rebase origin",
     "install_ngh": "npm install -g angular-cli-ghpages",
@@ -37,23 +37,23 @@
     "zone.js": "~0.8.26"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "~0.13.0",
-    "@angular-devkit/build-ng-packagr": "~0.13.0",
-    "@angular/cli": "~7.3.0",
-    "@angular/compiler-cli": "~7.2.0",
-    "@angular/language-service": "~7.2.0",
-    "@types/node": "~8.9.4",
+    "@angular-devkit/build-angular": "^0.13.8",
+    "@angular-devkit/build-ng-packagr": "~0.13.8",
+    "@angular/cli": "~7.3.8",
+    "@angular/compiler-cli": "^7.2.14",
+    "@angular/language-service": "~7.2.14",
     "@types/jasmine": "~2.8.8",
     "@types/jasminewd2": "~2.0.3",
+    "@types/node": "~8.9.4",
     "codelyzer": "~4.5.0",
     "jasmine-core": "~2.99.1",
     "jasmine-spec-reporter": "~4.2.1",
-    "karma": "~3.1.1",
+    "karma": "^4.1.0",
     "karma-chrome-launcher": "~2.2.0",
     "karma-coverage-istanbul-reporter": "~2.0.1",
     "karma-jasmine": "~1.1.2",
     "karma-jasmine-html-reporter": "^0.2.2",
-    "ng-packagr": "^4.2.0",
+    "ng-packagr": "^5.1.0",
     "protractor": "~5.4.0",
     "ts-node": "~7.0.0",
     "tsickle": ">=0.34.0",
diff --git a/projects/virtual-repeat-angular-lib/package.json b/projects/virtual-repeat-angular-lib/package.json
index 9e6b290..9cae3c5 100644
--- a/projects/virtual-repeat-angular-lib/package.json
+++ b/projects/virtual-repeat-angular-lib/package.json
@@ -1,6 +1,6 @@
 {
   "name": "virtual-repeat-angular",
-  "version": "0.4.5",
+  "version": "0.4.6",
   "author": {
     "name": "Gerard Carbó"
   },
@@ -8,5 +8,16 @@
   "peerDependencies": {
     "@angular/common": ">=5 <=7",
     "@angular/core": ">=5 <=7"
-  }
+  },
+  "keywords": [
+    "ngx",
+    "angular2",
+    "virtual scroll",
+    "virtual repeat",
+    "infinite list",
+    "infinite scroll",
+    "variable height",
+    "reactive",
+    "async"
+    ]
 }
diff --git a/projects/virtual-repeat-angular-lib/src/lib/rxjs.operators.ts b/projects/virtual-repeat-angular-lib/src/lib/rxjs.operators.ts
index a54ba10..4d5b462 100644
--- a/projects/virtual-repeat-angular-lib/src/lib/rxjs.operators.ts
+++ b/projects/virtual-repeat-angular-lib/src/lib/rxjs.operators.ts
@@ -6,7 +6,7 @@ const logger = new LoggerService();
 
 /**
  * If observable value has not changed act as throttleTime, but if changed notify it inmediatly.
- * @param {number} throttleTime throttle time in miliseconds.
+ * @param throttleTime throttle time in miliseconds.
  */
 export function throttleTimeUntilChanged(throttleTime: number) {
   return (source: Observable<any>) => {
@@ -35,7 +35,7 @@ export function throttleTimeUntilChanged(throttleTime: number) {
 
 /**
  * Remove spurious changes on a boolean observable.
- * @param {number} glitchSize max size of the gitches (in miliseconds) to be removed.
+ * @param glitchSize max size of the gitches (in miliseconds) to be removed.
  */
 export function deglitch(glitchSize: number) {
   return (source: Observable<boolean>) => {
@@ -92,7 +92,7 @@ export function deglitch(glitchSize: number) {
 
 /**
  * Remove spurious falses on a boolean observable.
- * @param {number} glitchSize max size of the gitches (in miliseconds) to be removed.
+ * @param glitchSize max size of the gitches (in miliseconds) to be removed.
  */
 export function deglitchFalse(glitchSize: number) {
   return (source: Observable<boolean>) => {
diff --git a/src/app/reactive-collection.service.ts b/src/app/reactive-collection.service.ts
index 8b2a38f..c804a1f 100644
--- a/src/app/reactive-collection.service.ts
+++ b/src/app/reactive-collection.service.ts
@@ -88,8 +88,9 @@ export class ReactiveCollectionService<T> implements IReactiveCollection<T> {
         this.logger.log('requestPageSubject: getPage ' + page);
         return this.remoteService.getPage(page).pipe(
           map((items: any[]) => {
-            // check if already received
+            // check if already received and add to _collection
             this.logger.log('requestPageSubject: filling page ' + page);
+
             // fill sparse collection
             items.forEach((item, i) => {
               const index = (page * this._itemsPerPage) + i;