diff --git a/aio/package.json b/aio/package.json
index 2e3810f776..4c7112df31 100644
--- a/aio/package.json
+++ b/aio/package.json
@@ -107,7 +107,7 @@
     "cross-spawn": "^5.1.0",
     "css-selector-parser": "^1.3.0",
     "dgeni": "^0.4.7",
-    "dgeni-packages": "^0.24.2",
+    "dgeni-packages": "^0.24.3",
     "entities": "^1.1.1",
     "eslint": "^3.19.0",
     "eslint-plugin-jasmine": "^2.2.0",
diff --git a/aio/tools/transforms/templates/api/lib/paramList.html b/aio/tools/transforms/templates/api/lib/paramList.html
index 3f5ac09c82..0dab24e472 100644
--- a/aio/tools/transforms/templates/api/lib/paramList.html
+++ b/aio/tools/transforms/templates/api/lib/paramList.html
@@ -20,7 +20,7 @@
       <td class="param-name"><a id="{$ parameter.anchor $}"></a>{$ parameter.name $}</td>
       <td class="param-description">
       {% marked %}
-        {% if parameter.isOptional %}Optional.{% endif %}
+        {% if parameter.isOptional or parameter.defaultValue !== undefined %}Optional. Default is `{$ parameter.defaultValue === undefined and 'undefined' or parameter.defaultValue $}`.{% endif %}
 
         {% if parameter.description | trim %}{$ parameter.description $}
         {% elseif parameter.type %}<code>{$ parameter.type $}</code>
diff --git a/aio/yarn.lock b/aio/yarn.lock
index bda10a5322..a2287ddccb 100644
--- a/aio/yarn.lock
+++ b/aio/yarn.lock
@@ -2312,9 +2312,9 @@ devtools-timeline-model@1.1.6:
     chrome-devtools-frontend "1.0.401423"
     resolve "1.1.7"
 
-dgeni-packages@^0.24.2:
-  version "0.24.2"
-  resolved "https://registry.yarnpkg.com/dgeni-packages/-/dgeni-packages-0.24.2.tgz#88e75f0f4cfd135a2c6c8ec431b66f32d63760d2"
+dgeni-packages@^0.24.3:
+  version "0.24.3"
+  resolved "https://registry.yarnpkg.com/dgeni-packages/-/dgeni-packages-0.24.3.tgz#153ce2bf9d71a70cd8c71171c7f49adf0d725ab9"
   dependencies:
     canonical-path "0.0.2"
     catharsis "^0.8.1"