diff --git a/doc/classes/CharacterBody2D.xml b/doc/classes/CharacterBody2D.xml
index 28060f6579ac..63d493248f7f 100644
--- a/doc/classes/CharacterBody2D.xml
+++ b/doc/classes/CharacterBody2D.xml
@@ -183,7 +183,7 @@
If [code]true[/code], during a jump against the ceiling, the body will slide, if [code]false[/code] it will be stopped and will fall vertically.
- Direction vector used to determine what is a wall and what is a floor (or a ceiling), rather than a wall, when calling [method move_and_slide]. Defaults to [code]Vector2.UP[/code]. If set to [code]Vector2(0, 0)[/code], everything is considered a wall. This is useful for topdown games.
+ Vector pointing upwards, used to determine what is a wall and what is a floor (or a ceiling) when calling [method move_and_slide]. Defaults to [code]Vector2.UP[/code]. As the vector will be normalized it can't be equal to [constant Vector2.ZERO], if you want all collisions to be reported as walls, consider using [constant MOTION_MODE_FLOATING] as [member motion_mode].
Current velocity vector in pixels per second, used and modified during calls to [method move_and_slide].
diff --git a/doc/classes/CharacterBody3D.xml b/doc/classes/CharacterBody3D.xml
index 4895e2cff73d..6c5cd62fe177 100644
--- a/doc/classes/CharacterBody3D.xml
+++ b/doc/classes/CharacterBody3D.xml
@@ -168,7 +168,7 @@
If [code]true[/code], during a jump against the ceiling, the body will slide, if [code]false[/code] it will be stopped and will fall vertically.
- Direction vector used to determine what is a wall and what is a floor (or a ceiling), rather than a wall, when calling [method move_and_slide]. Defaults to [code]Vector3.UP[/code]. If set to [code]Vector3(0, 0, 0)[/code], everything is considered a wall. This is useful for topdown games.
+ Vector pointing upwards, used to determine what is a wall and what is a floor (or a ceiling) when calling [method move_and_slide]. Defaults to [code]Vector3.UP[/code]. As the vector will be normalized it can't be equal to [constant Vector3.ZERO], if you want all collisions to be reported as walls, consider using [constant MOTION_MODE_FLOATING] as [member motion_mode].
Current velocity vector (typically meters per second), used and modified during calls to [method move_and_slide].