diff --git a/app/controllers/chat_controller.rb b/app/controllers/chat_controller.rb
index 42879f8..82126ea 100644
--- a/app/controllers/chat_controller.rb
+++ b/app/controllers/chat_controller.rb
@@ -118,7 +118,7 @@ class DiscourseChat::ChatController < ApplicationController
 
   def create_rule
     begin
-      hash = params.require(:rule).permit(:channel_id, :filter, :category_id, tags:[])
+      hash = params.require(:rule).permit(:channel_id, :filter, :group_id, :category_id, tags:[])
 
       rule = DiscourseChat::Rule.new(hash)
       
@@ -135,7 +135,7 @@ class DiscourseChat::ChatController < ApplicationController
   def update_rule
     begin
       rule = DiscourseChat::Rule.find(params[:id].to_i)
-      hash = params.require(:rule).permit(:filter, :category_id, tags:[])
+      hash = params.require(:rule).permit(:filter, :group_id, :category_id, tags:[])
       
       if not rule.update(hash)
         raise Discourse::InvalidParameters, 'Rule is not valid'
diff --git a/app/models/rule.rb b/app/models/rule.rb
index 6ccd4f4..e485deb 100644
--- a/app/models/rule.rb
+++ b/app/models/rule.rb
@@ -2,7 +2,7 @@ class DiscourseChat::Rule < DiscourseChat::PluginModel
   KEY_PREFIX = 'rule:'
 
   # Setup ActiveRecord::Store to use the JSON field to read/write these values
-  store :value, accessors: [ :channel_id, :category_id, :tags, :filter ], coder: JSON
+  store :value, accessors: [ :channel_id, :group_id, :category_id, :tags, :filter ], coder: JSON
 
   after_initialize :init_filter
 
@@ -13,16 +13,29 @@ class DiscourseChat::Rule < DiscourseChat::PluginModel
   validates :filter, :inclusion => { :in => %w(watch follow mute),
     :message => "%{value} is not a valid filter" }
 
-  validate :channel_valid?, :category_valid?, :tags_valid?
+  validate :channel_valid?, :category_and_group_valid?, :tags_valid?
 
   def channel_valid?
-    # Validate category
+    # Validate channel
     if not (DiscourseChat::Channel.where(id: channel_id).exists?)
       errors.add(:channel_id, "#{channel_id} is not a valid channel id")
     end
   end
 
-  def category_valid?
+  def category_and_group_valid?
+    if category_id and group_id
+      errors.add(:category_id, "cannot be specified in addition to group_id")
+      return
+    end
+
+    if group_id
+      # Validate group
+      if not Group.where(id: group_id).exists?
+        errors.add(:group_id, "#{group_id} is not a valid group id")
+      end
+      return
+    end
+
     # Validate category
     if not (category_id.nil? or Category.where(id: category_id).exists?)
       errors.add(:category_id, "#{category_id} is not a valid category id")
@@ -79,6 +92,7 @@ class DiscourseChat::Rule < DiscourseChat::PluginModel
   scope :with_channel_id, ->(channel_id) { where("value::json->>'channel_id'=?", channel_id.to_s)} 
 
   scope :with_category_id, ->(category_id) { category_id.nil? ? where("(value::json->'category_id') IS NULL OR json_typeof(value::json->'category_id')='null'") : where("value::json->>'category_id'=?", category_id.to_s)}
+  scope :with_group_ids, ->(group_id) { where("value::json->>'group_id' IN (?)", group_id.map(&:to_s))}
 
   scope :order_by_precedence, ->{ order("CASE
                                           WHEN value::json->>'filter' = 'mute' THEN 1
diff --git a/app/serializers/rule_serializer.rb b/app/serializers/rule_serializer.rb
index 57a0581..e3b9cb6 100644
--- a/app/serializers/rule_serializer.rb
+++ b/app/serializers/rule_serializer.rb
@@ -1,3 +1,14 @@
 class DiscourseChat::RuleSerializer < ApplicationSerializer
-  attributes :id, :channel_id, :category_id, :tags, :filter
+  attributes :id, :channel_id, :group_id, :group_name, :category_id, :tags, :filter
+
+  def group_name
+    if object.group_id
+      groups = Group.where(id:object.group_id)
+      if groups.exists?
+        return groups.first.name
+      else
+        return I18n.t("chat_integration.deleted_group")
+      end
+    end
+  end
 end
\ No newline at end of file
diff --git a/app/services/manager.rb b/app/services/manager.rb
index 78bee22..d4fd9b9 100644
--- a/app/services/manager.rb
+++ b/app/services/manager.rb
@@ -18,14 +18,19 @@ module DiscourseChat
 
       topic = post.topic
 
-      # Abort if a private message (possible TODO: Add support for notifying about group PMs)
-      return if topic.blank? || topic.archetype == Archetype.private_message
+      # Abort if topic is blank... this should never be the case
+      return if topic.blank?
 
-      # Load all the rules that apply to this topic's category
-      matching_rules = DiscourseChat::Rule.with_category_id(topic.category_id)
-
-      if topic.category # Also load the rules for the wildcard category
-        matching_rules += DiscourseChat::Rule.with_category_id(nil)
+      # If it's a private message, filter rules by groups, otherwise filter rules by category
+      if topic.archetype == Archetype.private_message
+        group_ids_with_access = topic.topic_allowed_groups.pluck(:group_id)
+        return if group_ids_with_access.empty?
+        matching_rules = DiscourseChat::Rule.with_group_ids(group_ids_with_access)
+      else
+        matching_rules = DiscourseChat::Rule.with_category_id(topic.category_id)
+        if topic.category # Also load the rules for the wildcard category
+          matching_rules += DiscourseChat::Rule.with_category_id(nil)
+        end
       end
 
       # If tagging is enabled, thow away rules that don't apply to this topic
diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 559b491..7b889d1 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -60,6 +60,7 @@ en:
     
     all_categories: "(all categories)"
     deleted_category: "(deleted category)"
+    deleted_group: "(deleted group)"
 
     provider:
 
diff --git a/spec/models/rule_spec.rb b/spec/models/rule_spec.rb
index f292741..bace0c6 100644
--- a/spec/models/rule_spec.rb
+++ b/spec/models/rule_spec.rb
@@ -8,6 +8,8 @@ RSpec.describe DiscourseChat::Rule do
   let(:tag2){Fabricate(:tag)}
 
   let(:channel){DiscourseChat::Channel.create(provider:'dummy')}
+  let(:category) {Fabricate(:category)}
+  let(:group) {Fabricate(:group)}
 
   describe '.alloc_key' do
     it 'should return sequential numbers' do 
@@ -28,7 +30,7 @@ RSpec.describe DiscourseChat::Rule do
 
     rule = DiscourseChat::Rule.create({
           channel: channel,
-          category_id: 1,
+          category_id: category.id,
           tags: [tag1.name, tag2.name],
           filter: 'watch'
         })
@@ -38,7 +40,7 @@ RSpec.describe DiscourseChat::Rule do
     loadedRule = DiscourseChat::Rule.find(rule.id)
 
     expect(loadedRule.channel.id).to eq(channel.id)
-    expect(loadedRule.category_id).to eq(1)
+    expect(loadedRule.category_id).to eq(category.id)
     expect(loadedRule.tags).to contain_exactly(tag1.name,tag2.name)
     expect(loadedRule.filter).to eq('watch')
 
@@ -48,7 +50,7 @@ RSpec.describe DiscourseChat::Rule do
     before do
       rule = DiscourseChat::Rule.create({
           channel: channel,
-          category_id: 1,
+          category_id: category.id,
           tags: [tag1.name, tag2.name]
         })
     end
@@ -102,15 +104,29 @@ RSpec.describe DiscourseChat::Rule do
     end
 
     it 'can be filtered by category' do
-      rule2 = DiscourseChat::Rule.create(channel:channel, category_id: 1)
+      rule2 = DiscourseChat::Rule.create(channel:channel, category_id: category.id)
       rule3 = DiscourseChat::Rule.create(channel:channel, category_id: nil)
 
       expect(DiscourseChat::Rule.all.length).to eq(3)
 
-      expect(DiscourseChat::Rule.with_category_id(1).length).to eq(2)
+      expect(DiscourseChat::Rule.with_category_id(category.id).length).to eq(2)
       expect(DiscourseChat::Rule.with_category_id(nil).length).to eq(1)
     end
 
+    it 'can be filtered by group' do
+      group1 = Fabricate(:group)
+      group2 = Fabricate(:group)
+      rule2 = DiscourseChat::Rule.create(channel:channel, group_id: group1.id)
+      rule3 = DiscourseChat::Rule.create(channel:channel, group_id: group2.id)
+
+      expect(DiscourseChat::Rule.all.length).to eq(3)
+
+      expect(DiscourseChat::Rule.with_category_id(category.id).length).to eq(1)
+      expect(DiscourseChat::Rule.with_group_ids([group1.id,group2.id]).length).to eq(2)
+      expect(DiscourseChat::Rule.with_group_ids([group1.id]).length).to eq(1)
+      expect(DiscourseChat::Rule.with_group_ids([group2.id]).length).to eq(1)
+    end
+
     it 'can be sorted by precedence' do
       rule2 = DiscourseChat::Rule.create(channel:channel, filter:'mute')
       rule3 = DiscourseChat::Rule.create(channel:channel, filter:'follow')
@@ -128,7 +144,7 @@ RSpec.describe DiscourseChat::Rule do
       DiscourseChat::Rule.create({
           filter: 'watch',
           channel: channel,
-          category_id: 1,
+          category_id: category.id,
         })
     end
 
@@ -140,9 +156,25 @@ RSpec.describe DiscourseChat::Rule do
       expect(rule.valid?).to eq(false)
     end
 
+    it "doesn't allow both category and group to be set" do
+      expect(rule.valid?).to eq(true)
+      rule.group_id = group.id
+      expect(rule.valid?).to eq(false)
+      rule.category_id = nil
+      expect(rule.valid?).to eq(true)
+    end
+
+    it 'validates group correctly' do
+      rule.category_id = nil
+      rule.group_id = group.id
+      expect(rule.valid?).to eq(true)
+      rule.group_id = -99
+      expect(rule.valid?).to eq(false)
+    end
+
     it 'validates category correctly' do
       expect(rule.valid?).to eq(true)
-      rule.category_id = 99
+      rule.category_id = -99
       expect(rule.valid?).to eq(false)
     end
 
diff --git a/spec/services/manager_spec.rb b/spec/services/manager_spec.rb
index 2180c04..e35cb09 100644
--- a/spec/services/manager_spec.rb
+++ b/spec/services/manager_spec.rb
@@ -6,6 +6,7 @@ RSpec.describe DiscourseChat::Manager do
 
   let(:manager) {::DiscourseChat::Manager}  
   let(:category) {Fabricate(:category)}
+  let(:group) {Fabricate(:group)}
   let(:topic){Fabricate(:topic, category_id: category.id )}
   let(:first_post) {Fabricate(:post, topic: topic)}
   let(:second_post) {Fabricate(:post, topic: topic, post_number:2)}
@@ -107,6 +108,32 @@ RSpec.describe DiscourseChat::Manager do
       expect(provider.sent_to_channel_ids).to contain_exactly()
     end
 
+    it "should work for group pms" do
+      DiscourseChat::Rule.create!(channel: chan1, filter: 'watch' ) # Wildcard watch
+      DiscourseChat::Rule.create!(channel: chan2, filter: 'watch', group_id: group.id ) # Group watch
+      
+      private_post = Fabricate(:private_message_post)
+      private_post.topic.invite_group(Fabricate(:user), group)
+
+      manager.trigger_notifications(private_post.id)
+
+      expect(provider.sent_to_channel_ids).to contain_exactly(chan2.id)
+    end
+
+    it "should work for pms with multiple groups" do
+      group2 = Fabricate(:group)
+      DiscourseChat::Rule.create!(channel: chan1, filter: 'watch', group_id: group.id )
+      DiscourseChat::Rule.create!(channel: chan2, filter: 'watch', group_id: group2.id )
+
+      private_post = Fabricate(:private_message_post)
+      private_post.topic.invite_group(Fabricate(:user), group)
+      private_post.topic.invite_group(Fabricate(:user), group2)
+
+      manager.trigger_notifications(private_post.id)
+
+      expect(provider.sent_to_channel_ids).to contain_exactly(chan1.id, chan2.id)
+    end
+
     it "should not notify about posts the chat_user cannot see" do
       DiscourseChat::Rule.create!(channel: chan1, filter: 'follow', category_id: nil ) # Wildcard watch