diff --git a/doc/classes/ClassDB.xml b/doc/classes/ClassDB.xml
index 3e647446dad..35cf8199595 100644
--- a/doc/classes/ClassDB.xml
+++ b/doc/classes/ClassDB.xml
@@ -1,8 +1,10 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="ClassDB" inherits="Object" category="Core" version="3.0.alpha.custom_build">
 	<brief_description>
+		Class information repository.
 	</brief_description>
 	<description>
+		Provides access to metadata stored for every available class.
 	</description>
 	<tutorials>
 	</tutorials>
@@ -15,6 +17,7 @@
 			<argument index="0" name="class" type="String">
 			</argument>
 			<description>
+				Returns true if you can instance objects from the specified 'class', false in other case.
 			</description>
 		</method>
 		<method name="class_exists" qualifiers="const">
@@ -23,6 +26,7 @@
 			<argument index="0" name="class" type="String">
 			</argument>
 			<description>
+				Returns whether the specified 'class' is available or not.
 			</description>
 		</method>
 		<method name="class_get_category" qualifiers="const">
@@ -41,6 +45,7 @@
 			<argument index="1" name="name" type="String">
 			</argument>
 			<description>
+				Returns the value of the integer constant 'name' of 'class' or its ancestry. Always returns 0 when the constant could not be found.
 			</description>
 		</method>
 		<method name="class_get_integer_constant_list" qualifiers="const">
@@ -51,6 +56,7 @@
 			<argument index="1" name="no_inheritance" type="bool" default="false">
 			</argument>
 			<description>
+				Returns an array with the names all the integer constants of 'class' or its ancestry.
 			</description>
 		</method>
 		<method name="class_get_method_list" qualifiers="const">
@@ -61,6 +67,7 @@
 			<argument index="1" name="no_inheritance" type="bool" default="false">
 			</argument>
 			<description>
+				Returns an array with all the methods of 'class' or its ancestry if 'no_inheritance' is false. Every element of the array is a [Dictionary] with the following keys: args, default_args, flags, id, name, return: (class_name, hint, hint_string, name, type, usage).
 			</description>
 		</method>
 		<method name="class_get_property" qualifiers="const">
@@ -71,6 +78,7 @@
 			<argument index="1" name="property" type="String">
 			</argument>
 			<description>
+				Returns the value of 'property' of 'class' or its ancestry.
 			</description>
 		</method>
 		<method name="class_get_property_list" qualifiers="const">
@@ -81,6 +89,7 @@
 			<argument index="1" name="no_inheritance" type="bool" default="false">
 			</argument>
 			<description>
+				Returns an array with all the properties of 'class' or its ancestry if 'no_inheritance' is false.
 			</description>
 		</method>
 		<method name="class_get_signal" qualifiers="const">
@@ -91,6 +100,7 @@
 			<argument index="1" name="signal" type="String">
 			</argument>
 			<description>
+				Returns the 'signal' data of 'class' or its ancestry. The returned value is a [Dictionary] with the following keys: args, default_args, flags, id, name, return: (class_name, hint, hint_string, name, type, usage).
 			</description>
 		</method>
 		<method name="class_get_signal_list" qualifiers="const">
@@ -101,6 +111,7 @@
 			<argument index="1" name="no_inheritance" type="bool" default="false">
 			</argument>
 			<description>
+				Returns an array with all the signals of 'class' or its ancestry if 'no_inheritance' is false. Every element of the array is a [Dictionary] as described in [class_get_signal].
 			</description>
 		</method>
 		<method name="class_has_integer_constant" qualifiers="const">
@@ -111,6 +122,7 @@
 			<argument index="1" name="name" type="String">
 			</argument>
 			<description>
+				Return whether 'class' or its ancestry has an integer constant called 'name' or not.
 			</description>
 		</method>
 		<method name="class_has_method" qualifiers="const">
@@ -123,6 +135,7 @@
 			<argument index="2" name="no_inheritance" type="bool" default="false">
 			</argument>
 			<description>
+				Return whether 'class' (or its ancestry if 'no_inheritance' is false) has a method called 'method' or not.
 			</description>
 		</method>
 		<method name="class_has_signal" qualifiers="const">
@@ -133,6 +146,7 @@
 			<argument index="1" name="signal" type="String">
 			</argument>
 			<description>
+				Return whether 'class' or its ancestry has a signal called 'signal' or not.
 			</description>
 		</method>
 		<method name="class_set_property" qualifiers="const">
@@ -145,12 +159,14 @@
 			<argument index="2" name="value" type="Variant">
 			</argument>
 			<description>
+				Sets 'property' value of 'class' to 'value'.
 			</description>
 		</method>
 		<method name="get_class_list" qualifiers="const">
 			<return type="PoolStringArray">
 			</return>
 			<description>
+				Returns the names of all the classes available.
 			</description>
 		</method>
 		<method name="get_inheriters_from_class" qualifiers="const">
@@ -159,6 +175,7 @@
 			<argument index="0" name="class" type="String">
 			</argument>
 			<description>
+				Returns the names of all the classes that directly or indirectly inherit from 'class'.
 			</description>
 		</method>
 		<method name="get_parent_class" qualifiers="const">
@@ -167,6 +184,7 @@
 			<argument index="0" name="class" type="String">
 			</argument>
 			<description>
+				Returns the parent class of 'class'.
 			</description>
 		</method>
 		<method name="instance" qualifiers="const">
@@ -175,6 +193,7 @@
 			<argument index="0" name="class" type="String">
 			</argument>
 			<description>
+				Creates an instance of 'class'.
 			</description>
 		</method>
 		<method name="is_class_enabled" qualifiers="const">
@@ -183,6 +202,7 @@
 			<argument index="0" name="class" type="String">
 			</argument>
 			<description>
+				Returns whether this class is enabled or not.
 			</description>
 		</method>
 		<method name="is_parent_class" qualifiers="const">
@@ -193,6 +213,7 @@
 			<argument index="1" name="inherits" type="String">
 			</argument>
 			<description>
+				Returns whether 'inherits' is an ancestor of 'class' or not.
 			</description>
 		</method>
 	</methods>
diff --git a/doc/classes/Marshalls.xml b/doc/classes/Marshalls.xml
index 6870764b686..b443d031080 100644
--- a/doc/classes/Marshalls.xml
+++ b/doc/classes/Marshalls.xml
@@ -1,8 +1,10 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="Marshalls" inherits="Reference" category="Core" version="3.0.alpha.custom_build">
 	<brief_description>
+		Data transformation (marshalling) and encoding helpers.
 	</brief_description>
 	<description>
+		Provides data transformation and encoding utility functions.
 	</description>
 	<tutorials>
 	</tutorials>