diff --git a/addon/helpers/voca-count-substrings.js b/addon/helpers/voca-count-substrings.js
index 0639a75..a8c952c 100644
--- a/addon/helpers/voca-count-substrings.js
+++ b/addon/helpers/voca-count-substrings.js
@@ -1,6 +1,6 @@
 import { helper } from '@ember/component/helper';
 import { countSubstrings } from 'voca';
 
-export default helper(function vocaCountSubstrings(params/*, hash */ ) {
-  return countSubstrings(params[0]);
+export default helper(function vocaCountSubstrings(params ) {
+  return countSubstrings(params[0], params[1]);
 });
diff --git a/addon/helpers/voca-count-where.js b/addon/helpers/voca-count-where.js
index da48610..45eb046 100644
--- a/addon/helpers/voca-count-where.js
+++ b/addon/helpers/voca-count-where.js
@@ -1,6 +1,6 @@
 import { helper } from '@ember/component/helper';
 import { countWhere } from 'voca';
 
-export default helper(function vocaCountWhere(params/*, hash */ ) {
-  return countWhere(params[0]);
+export default helper(function vocaCountWhere(params) {
+  return countWhere(params[0], params[1]);
 });
diff --git a/addon/helpers/voca-grapheme-at.js b/addon/helpers/voca-grapheme-at.js
index 8ae29ba..a1490e3 100644
--- a/addon/helpers/voca-grapheme-at.js
+++ b/addon/helpers/voca-grapheme-at.js
@@ -1,6 +1,6 @@
 import { helper } from '@ember/component/helper';
 import { graphemeAt } from 'voca';
 
-export default helper(function vocaGraphemeAt(params/*, hash */ ) {
-  return graphemeAt(params[0]);
+export default helper(function vocaGraphemeAt(params) {
+  return graphemeAt(params[0], params[1]);
 });
diff --git a/addon/helpers/voca-truncate.js b/addon/helpers/voca-truncate.js
index d0d2419..4adb2fe 100644
--- a/addon/helpers/voca-truncate.js
+++ b/addon/helpers/voca-truncate.js
@@ -1,6 +1,6 @@
 import { helper } from '@ember/component/helper';
 import { truncate } from 'voca';
 
-export default helper(function vocaTruncate(params/*, hash */ ) {
-  return truncate(params[0]);
+export default helper(function vocaTruncate(params) {
+  return truncate(params[0], params[1], params[2]);
 });
diff --git a/tests/dummy/app/templates/application.hbs b/tests/dummy/app/templates/application.hbs
index a4e6d15..fe327f8 100644
--- a/tests/dummy/app/templates/application.hbs
+++ b/tests/dummy/app/templates/application.hbs
@@ -1,10 +1,11 @@
 <div id="container">
 <div id="sidebar">
-<h2>ember-voca <span>v1.0.0</span></h2>
+<h2>ember-voca <span>v1.0.2</span></h2>
 <nav>
 <ul>
 <li><LinkTo @route="index">Home</LinkTo></li>
 <li><a href="https://github.com/rajasegar/ember-voca">Github</a></li>
+<li><a href="https://vocajs.com/">voca.js</a></li>
 </ul>
 </nav>
 
diff --git a/tests/dummy/app/templates/voca-count-substrings.hbs b/tests/dummy/app/templates/voca-count-substrings.hbs
index b63668b..d5b9dbc 100644
--- a/tests/dummy/app/templates/voca-count-substrings.hbs
+++ b/tests/dummy/app/templates/voca-count-substrings.hbs
@@ -1,13 +1,13 @@
-
   <h3>voca-count-substrings:</h3>
-  <p>Description for voca-count-substrings goes here.</p>
+  <hr>
+  <p>Counts the number of substring appearances in subject.</p>
   <p>
-  <code>
-  \{{ voca-count-substrings "hello world"}}
+    <code>
+  \{{ voca-count-substrings "bad boys, bad boys whatcha gonna do?" "boys"}}
   </code>
   </p>
   <p>
   <code>
-  // => {{ voca-count-substrings "hello world"}}
+  // => {{ voca-count-substrings "bad boys, bad boys whatcha gonna do?" "boys"}}
   </code>
   </p>
diff --git a/tests/dummy/app/templates/voca-count-where.hbs b/tests/dummy/app/templates/voca-count-where.hbs
index 8a2734a..b2240a5 100644
--- a/tests/dummy/app/templates/voca-count-where.hbs
+++ b/tests/dummy/app/templates/voca-count-where.hbs
@@ -1,13 +1,13 @@
-
-  <h3>voca-count-where:</h3>
-  <p>Description for voca-count-where goes here.</p>
-  <p>
+<h3>voca-count-where:</h3>
+<hr>
+<p>Counts the characters in subject for which predicate returns truthy.</p>
+<p>
   <code>
-  \{{ voca-count-where "hello world"}}
+  \{{ voca-count-where "hola" (voca-is-alpha)}}
   </code>
-  </p>
-  <p>
+</p>
+<p>
   <code>
-  // => {{ voca-count-where "hello world"}}
+  // => {{ voca-count-where "hola" (voca-is-alpha)}}
   </code>
-  </p>
+</p>
diff --git a/tests/dummy/app/templates/voca-count-words.hbs b/tests/dummy/app/templates/voca-count-words.hbs
index 2a5605a..647d699 100644
--- a/tests/dummy/app/templates/voca-count-words.hbs
+++ b/tests/dummy/app/templates/voca-count-words.hbs
@@ -1,13 +1,13 @@
-
-  <h3>voca-count-words:</h3>
-  <p>Description for voca-count-words goes here.</p>
-  <p>
+<h3>voca-count-words:</h3>
+<hr>
+<p>Count the number of words</p>
+<p>
   <code>
   \{{ voca-count-words "hello world"}}
   </code>
-  </p>
-  <p>
+</p>
+<p>
   <code>
   // => {{ voca-count-words "hello world"}}
   </code>
-  </p>
+</p>
diff --git a/tests/dummy/app/templates/voca-count.hbs b/tests/dummy/app/templates/voca-count.hbs
index 3c90807..4a4131f 100644
--- a/tests/dummy/app/templates/voca-count.hbs
+++ b/tests/dummy/app/templates/voca-count.hbs
@@ -1,6 +1,6 @@
-
   <h3>voca-count:</h3>
-  <p>Description for voca-count goes here.</p>
+  <hr>
+  <p>Count the characters</p>
   <p>
   <code>
   \{{ voca-count "hello world"}}
diff --git a/tests/dummy/app/templates/voca-grapheme-at.hbs b/tests/dummy/app/templates/voca-grapheme-at.hbs
index 64b3fd2..92991c1 100644
--- a/tests/dummy/app/templates/voca-grapheme-at.hbs
+++ b/tests/dummy/app/templates/voca-grapheme-at.hbs
@@ -1,13 +1,13 @@
-
-  <h3>voca-grapheme-at:</h3>
-  <p>Description for voca-grapheme-at goes here.</p>
-  <p>
+<h3>voca-grapheme-at:</h3>
+<hr>
+<p></p>
+<p>
   <code>
-  \{{ voca-grapheme-at "hello world"}}
+  \{{ voca-grapheme-at '\uD835\uDC00\uD835\uDC01' 0}}
   </code>
-  </p>
-  <p>
+</p>
+<p>
   <code>
-  // => {{ voca-grapheme-at "hello world"}}
+  // => {{ voca-grapheme-at "\uD835\uDC00\uD835\uDC01" 0}}
   </code>
-  </p>
+</p>
diff --git a/tests/dummy/app/templates/voca-substr.hbs b/tests/dummy/app/templates/voca-substr.hbs
index 3675299..ae426f5 100644
--- a/tests/dummy/app/templates/voca-substr.hbs
+++ b/tests/dummy/app/templates/voca-substr.hbs
@@ -1,6 +1,6 @@
 <h3>voca-substr:</h3>
 <hr>
-<p>Description for voca-substr goes here.</p>
+<p>Extracts from subject a string from start position a number of length characters.</p>
 <p>
   <code>
   \{{ voca-substr "infinite loop" 9}}
diff --git a/tests/dummy/app/templates/voca-truncate.hbs b/tests/dummy/app/templates/voca-truncate.hbs
index 0ceafb8..c5d20a5 100644
--- a/tests/dummy/app/templates/voca-truncate.hbs
+++ b/tests/dummy/app/templates/voca-truncate.hbs
@@ -1,13 +1,33 @@
-
-  <h3>voca-truncate:</h3>
-  <p>Description for voca-truncate goes here.</p>
-  <p>
+<h3>voca-truncate:</h3>
+<hr>
+<p>Truncates subject to a new length.</p>
+<p>
   <code>
-  \{{ voca-truncate "hello world"}}
+  \{{ voca-truncate "Once upon a time" 7}}
   </code>
-  </p>
-  <p>
+</p>
+<p>
   <code>
-  // => {{ voca-truncate "hello world"}}
+  // => {{ voca-truncate "Once upon a time" 7}}
   </code>
-  </p>
+</p>
+<p>
+  <code>
+  \{{ voca-truncate "Good day, Little Red Riding Hood" 14 "(...)"}}
+  </code>
+</p>
+<p>
+  <code>
+  // => {{ voca-truncate "Good day, Little Red Riding Hood" 14 "(...)"}}
+  </code>
+</p>
+<p>
+  <code>
+  \{{ voca-truncate "Once upon" 10}}
+  </code>
+</p>
+<p>
+  <code>
+  // => {{ voca-truncate "Once upon" 10}}
+  </code>
+</p>