diff --git a/app/components/table-filters/pablo-number-range.js b/app/components/table-filters/pablo-number-range.js
index 4ab2d4b..1be2123 100644
--- a/app/components/table-filters/pablo-number-range.js
+++ b/app/components/table-filters/pablo-number-range.js
@@ -15,8 +15,8 @@ export default Component.extend({
     filter_text: Ember.computed('{lower_bound,upper_bound,display_addition,inclusive}', function () {
         var lower_limit, upper_limit, range, isInclusive;
         isInclusive = this.get('inclusive');
-        lower_limit = this.get('lower_bound') || '-';
-        upper_limit = this.get('upper_bound') || '-';
+        lower_limit = this.get('lower_bound') || 'a';
+        upper_limit = this.get('upper_bound') || 'b';
         range = isInclusive ? `[${lower_limit}, ${upper_limit}]` : `(${lower_limit}, ${upper_limit})`;
         if (this.get('display_addition')) {
             range += " " + this.get('display_addition');
diff --git a/app/templates/components/table-filters/pablo-number-range.emblem b/app/templates/components/table-filters/pablo-number-range.emblem
index 716da5f..3a3d72e 100644
--- a/app/templates/components/table-filters/pablo-number-range.emblem
+++ b/app/templates/components/table-filters/pablo-number-range.emblem
@@ -14,6 +14,7 @@ ui-dropdown class='left basic labeled top left pointing icon select-number' acti
         .ui.pointing.red.basic.label {{error}}
     .item
       ui-checkbox class='item' checked=inclusive label=(t 'number.range.inclusive') onChange=(action 'toggle_inclusive')
+      ui-popup tagName="i" class="info circle icon" html=(t 'number.range.inclusive_explanation')
 
     .divider
     .options-container
diff --git a/tests/dummy/app/i18n/translations.coffee b/tests/dummy/app/i18n/translations.coffee
index 3289681..639f25f 100644
--- a/tests/dummy/app/i18n/translations.coffee
+++ b/tests/dummy/app/i18n/translations.coffee
@@ -67,4 +67,5 @@ window.$translations =
       range:
         between: 'Between'
         inclusive: 'inclusive'
+        inclusive_explanation: 'Include the <i><b>lower</b></i> and <i><b>upper</b></i> limits as valid elements. [a, b] means all the "x" elements that a <= x <= b; (a, b) means all the "x" elements that a < x < b.'
         lower_larger_than_upper_error: 'lower limit (%{lower}) cannot be greater than the upper limit (%{upper}).'