diff --git a/client/web/css/app.css b/client/web/css/app.css
index c5f93c8..df3e862 100644
--- a/client/web/css/app.css
+++ b/client/web/css/app.css
@@ -55,4 +55,8 @@ ul {
 
 .ir-popover-toggle:hover {
     cursor: pointer;
+}
+
+.ir-popover-width {
+   min-width: 400px;
 }
\ No newline at end of file
diff --git a/client/web/templates/irList.html b/client/web/templates/irList.html
index fea0367..634e0d0 100644
--- a/client/web/templates/irList.html
+++ b/client/web/templates/irList.html
@@ -22,7 +22,14 @@ <h4>Amongst patients taking <span class="text-capitalize">{{appModel.treatment.d
             <table class="table table-striped table-hover ">
                 <thead>
                 <tr>
-                    <th>Source</th>
+                    <th>Source
+                        <span uib-popover-template="'templates/source-popover.html'"
+                              popover-placement="auto bottom-right"
+                              popover-class="ir-popover-width"
+                              popover-is-open="showSourcePopover"
+                              ng-click="showSourcePopover = !showSourcePopover"
+                              class="small glyphicon glyphicon-info-sign ir-popover-toggle"></span>
+                    </th>
                     <th>Country</th>
                     <th>Condition</th>
                     <th>Incidence (%)</th>
diff --git a/client/web/templates/source-popover.html b/client/web/templates/source-popover.html
new file mode 100644
index 0000000..b6387e5
--- /dev/null
+++ b/client/web/templates/source-popover.html
@@ -0,0 +1,33 @@
+<dl>
+    <dt>CCAE</dt>
+    <dd>Truven MarketScan Commercial Claims and Encounters; USA (Population: 121.85 million)
+    </dd>
+    <dt>MDCR</dt>
+    <dd>Truven MarketScan Medicare Supplemental Beneficiaries; USA (Population: 9.25 million)
+    </dd>
+    <dt>MDCD</dt>
+    <dd>Truven MarketScan Multi-State Medicaid; USA (Population: 17.34 million)
+    </dd>
+    <dt>NYP</dt>
+    <dd>Columbia University Medical Center/New-York Presbyterian; USA (Population: 5 million)
+    </dd>
+    <dt>IMS-France</dt>
+    <dd>IMS Disease Analyzer - France (Population: 2.2 millions)
+    </dd>
+    <dt>IMS-Germany</dt>
+    <dd>IMS Disease Analyzer - Germany (Population: 8.875 millions)
+    </dd>
+    <dt>IMS-Australia</dt>
+    <dd>IMS Disease Analyzer - Australia (Population: 1.375 millions)
+    </dd>
+    <dt>JMDC</dt>
+    <dd>Japan Medical Data Center; Japan (Population: 3 millions)
+    </dd>
+    <dt>OPTUM EHR or SES</dt>
+    <dd>Optum ClinFormatics; USA (Population: 40.67 millions)
+    </dd>
+    <dt>Premier</dt>
+    <dd>Premier; USA (Population: 108 millions)
+    </dd>
+</dl>
+