diff --git a/Filters.md b/Filters.md
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--- a/Filters.md
+++ b/Filters.md
@@ -1,6 +1,12 @@
 A filter is a type of entity that normally holds a set of rules that other entities can use to determine behaviors, like a `trigger_once` using a `filter_activator_name` that only allows an entity with the name "cow" to pass it. [Click here for more information on filters in Source.](https://developer.valvesoftware.com/wiki/Category:Filters)
 
-In Mapbase, a large number of filters have been added to allow for more control and flexibility:
+In Mapbase, filters now support the following new I/O/KV:
+
+---
+
+### New filters
+
+In Mapbase, a large number of standard filters have been added to allow for more control and flexibility:
 
 |	Name		|	Description		|
 |:-------------:|:-------------|
@@ -8,8 +14,25 @@ In Mapbase, a large number of filters have been added to allow for more control
 | filter_activator_context	| Filters an entity by its response contexts. This entity already exists in all games starting with Left 4 Dead, but Mapbase allows for multiple contexts to be used at once and supports matchers. |
 | filter_activator_squad	| Filters an NPC by its squad name, with the option to deny silent members. (enemy finders, vital allies in player_squad, etc.) |
 | filter_activator_hintgroup	| Filters an NPC by its hint group, with the option to filter Hint Limit Nav. |
-| filter_activator_context	| Filters an entity by its response contexts. |
-| filter_activator_context	| Filters an entity by its response contexts. |
-| filter_activator_context	| Filters an entity by its response contexts. |
-| filter_activator_context	| Filters an entity by its response contexts. |
-| filter_activator_context	| Filters an entity by its response contexts. |
\ No newline at end of file
+| filter_activator_keyfield	| Filters an entity by its keyvalues, serving as an extension of logic_keyfield. |
+| filter_activator_relationship	| Filters an entity by its relationship to a target, or vice versa. |
+| filter_activator_classify	| Filters an entity by its `Classify()` class. (e.g. `CLASS_PLAYER_ALLY`) |
+| filter_activator_criteria	| Filters an entity by its response criteria normally used in the response system. |
+| filter_activator_involume	| Filters an entity by whether it's inside of a target entity's volume. (e.g. a trigger) |
+| filter_activator_surfacedata	| Filters an entity by its surface data. (e.g. whether it's made of wood) |
+
+Some of these filters have their own icons. (TODO: Show them here?)
+
+---
+
+### Redirect filters
+
+"Redirect" filters are a new type of filter that takes a separate entity from the activator and passes it to another filter. For example, `filter_redirect_weapon` gets the activator's weapon and could then pass it to a different filter, which then treats the weapon as the activator.
+
+Here's a list of the standard redirect filters introduced in Mapbase:
+
+|	Name		|	Description		|
+|:-------------:|:-------------|
+| filter_redirect_weapon	| Redirects the activator's weapon. (as a damage filter, this gets the weapon used in the damage) |
+| filter_redirect_owner	| Redirects the activator's owner entity. |
+| filter_redirect_inflictor	| As a damage filter, redirects the inflictor of the damage. (filters normally use the attacker) |
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