diff --git a/doc/base/classes.xml b/doc/base/classes.xml
index a3a03e39c06..c0474c3e2f0 100644
--- a/doc/base/classes.xml
+++ b/doc/base/classes.xml
@@ -2039,6 +2039,8 @@
 			<argument index="2" name="action" type="String" default="&quot;&quot;">
 			</argument>
 			<description>
+			Add custom button to the dialog and return the created button.
+			The button titled with [i]text[/i] and the [i]action[/i] will be passed to [custom_action] signal when it is pressed.
 			</description>
 		</method>
 		<method name="add_cancel">
@@ -2047,6 +2049,7 @@
 			<argument index="0" name="name" type="String">
 			</argument>
 			<description>
+			Add custom cancel button to the dialog and return the created button.
 			</description>
 		</method>
 		<method name="register_text_enter">
@@ -2200,6 +2203,7 @@
 	<signals>
 		<signal name="frame_changed">
 			<description>
+			Emmited when frame is changed.
 			</description>
 		</signal>
 	</signals>
@@ -5324,12 +5328,14 @@
 	<methods>
 		<method name="_pressed" qualifiers="virtual">
 			<description>
+			Called when button is pressed.
 			</description>
 		</method>
 		<method name="_toggled" qualifiers="virtual">
 			<argument index="0" name="pressed" type="bool">
 			</argument>
 			<description>
+			Called when button is toggled (only if toggle_mode is active).
 			</description>
 		</method>
 		<method name="set_pressed">
@@ -5350,6 +5356,7 @@
 			<return type="bool">
 			</return>
 			<description>
+			Return true if mouse entered the button before it exit.
 			</description>
 		</method>
 		<method name="set_toggle_mode">
@@ -5405,6 +5412,7 @@
 	<signals>
 		<signal name="released">
 			<description>
+			This signal is emitted when the button was released.
 			</description>
 		</signal>
 		<signal name="toggled">
@@ -5422,12 +5430,16 @@
 	</signals>
 	<constants>
 		<constant name="DRAW_NORMAL" value="0">
+		The normal state(Are not pressed, not hovered, not toggled and enabled) of buttons.
 		</constant>
 		<constant name="DRAW_PRESSED" value="1">
+		The state of buttons are pressed.
 		</constant>
 		<constant name="DRAW_HOVER" value="2">
+		The state of buttons are hovered.
 		</constant>
 		<constant name="DRAW_DISABLED" value="3">
+		The state of buttons are disabled.
 		</constant>
 	</constants>
 </class>
@@ -7691,6 +7703,7 @@
 			<argument index="0" name="over" type="Color">
 			</argument>
 			<description>
+			Return a new color blended with anothor one.
 			</description>
 		</method>
 		<method name="contrasted">
@@ -11577,6 +11590,7 @@ Returns an empty String "" at the end of the list.
 			<return type="bool">
 			</return>
 			<description>
+				Should put children to the top left corner instead of center of the container.
 			</description>
 		</method>
 	</methods>
diff --git a/scene/gui/dialogs.cpp b/scene/gui/dialogs.cpp
index d00dacd2563..51242d89bdc 100644
--- a/scene/gui/dialogs.cpp
+++ b/scene/gui/dialogs.cpp
@@ -285,7 +285,7 @@ Button* AcceptDialog::add_cancel(const String &p_cancel) {
 	String c = p_cancel;
 	if (p_cancel=="")
 		c="Cancel";
-	Button *b = swap_ok_cancel ? add_button("Cancel",true) : add_button("Cancel");
+	Button *b = swap_ok_cancel ? add_button(c,true) : add_button(c);
 	b->connect("pressed",this,"_closed");
 	return b;
 }