diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 4b20292..50a598d 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -1,5 +1,10 @@
 = PopPage Changelog
 
+== poppage-0.5.3 (2017-10-23)
+=== Added
+  - New `debug` CLI function.
+  - YAML tag `!def` to handle special logic for `__def__` YAML key.
+
 == poppage-0.5.2 (2017-10-23)
 === Fixed
   - The OUTPATH defined in the `__def__` YAML key is now rooted at the utility working directory rather than the defaults file location.
diff --git a/README.adoc b/README.adoc
index f22e63e..339b256 100644
--- a/README.adoc
+++ b/README.adoc
@@ -68,6 +68,7 @@ The following custom YAML tags are provided:
 
   - `!file` - Reads value from a file as a string.
   - `!yaml` - Reads value from file as YAML.
+  - `!def` - Like `!yaml` but only for populating the `__def__` key.
   - `!cmd` - Reads value from a CLI command output.
   - `!ask` - Prompts the user to input a value.
 
@@ -118,6 +119,10 @@ Check out these examples:
             inpath: template.jinja2
             execute: python {{outpath}}
 
+  - Populate the options using a YAML file:
+
+        __def__: !def mydefs.yaml
+
 === Cookiecutter Compatiblity
 PopPage should be compatible with many https://github.com/audreyr/cookiecutter[cookiecutter] templates. Using https://github.com/solarnz/cookiecutter-avr as an example, check for the variables in the template:
 
diff --git a/app/poppage.py b/app/poppage.py
index bc98f61..cbddb86 100644
--- a/app/poppage.py
+++ b/app/poppage.py
@@ -80,7 +80,7 @@
 ##==============================================================#
 
 #: Application version string.
-__version__ = "0.5.2"
+__version__ = "0.5.3"
 
 #: Key separator.
 KEYSEP = "::"
diff --git a/app/setup.py b/app/setup.py
index f0c3d33..0b4502b 100644
--- a/app/setup.py
+++ b/app/setup.py
@@ -22,7 +22,7 @@
 
 setup(
     name = "poppage",
-    version = "0.5.2",
+    version = "0.5.3",
     author = "Jeff Rimko",
     author_email = "jeffrimko@gmail.com",
     description = "Utility for generating files and directories from templates.",