diff --git a/app/services/system_note_service.rb b/app/services/system_note_service.rb
index a11bca00687..110072e3a16 100644
--- a/app/services/system_note_service.rb
+++ b/app/services/system_note_service.rb
@@ -118,16 +118,18 @@ module SystemNoteService
   #
   # Example Note text:
   #
-  #   "Changed estimate of this issue to 3d 5h"
+  #   "removed time estimate"
+  #
+  #   "changed time estimate to 3d 5h"
   #
   # Returns the created Note object
 
   def change_time_estimate(noteable, project, author)
     parsed_time = Gitlab::TimeTrackingFormatter.output(noteable.time_estimate)
     body = if noteable.time_estimate == 0
-             "Removed time estimate on this #{noteable.human_class_name}"
+             "removed time estimate"
            else
-             "Changed time estimate of this #{noteable.human_class_name} to #{parsed_time}"
+             "changed time estimate to #{parsed_time}"
            end
 
     create_note(noteable: noteable, project: project, author: author, note: body)
@@ -142,7 +144,9 @@ module SystemNoteService
   #
   # Example Note text:
   #
-  #   "Added 2h 30m of time spent on this issue"
+  #   "removed time spent"
+  #
+  #   "added 2h 30m of time spent"
   #
   # Returns the created Note object
 
@@ -150,11 +154,11 @@ module SystemNoteService
     time_spent = noteable.time_spent
 
     if time_spent == :reset
-      body = "Removed time spent on this #{noteable.human_class_name}"
+      body = "removed time spent"
     else
       parsed_time = Gitlab::TimeTrackingFormatter.output(time_spent.abs)
-      action = time_spent > 0 ? 'Added' : 'Subtracted'
-      body = "#{action} #{parsed_time} of time spent on this #{noteable.human_class_name}"
+      action = time_spent > 0 ? 'added' : 'subtracted'
+      body = "#{action} #{parsed_time} of time spent"
     end
 
     create_note(noteable: noteable, project: project, author: author, note: body)
@@ -221,7 +225,7 @@ module SystemNoteService
   end
 
   def discussion_continued_in_issue(discussion, project, author, issue)
-    body = "Added #{issue.to_reference} to continue this discussion"
+    body = "created #{issue.to_reference} to continue this discussion"
     note_attributes = discussion.reply_attributes.merge(project: project, author: author, note: body)
     note_attributes[:type] = note_attributes.delete(:note_type)
 
@@ -260,7 +264,7 @@ module SystemNoteService
   #
   # Example Note text:
   #
-  # "made the issue confidential"
+  #   "made the issue confidential"
   #
   # Returns the created Note object
   def change_issue_confidentiality(issue, project, author)
diff --git a/changelogs/unreleased/pms-lowercase-system-notes.yml b/changelogs/unreleased/pms-lowercase-system-notes.yml
new file mode 100644
index 00000000000..c2fa1a7fad0
--- /dev/null
+++ b/changelogs/unreleased/pms-lowercase-system-notes.yml
@@ -0,0 +1,4 @@
+---
+title: Make all system notes lowercase
+merge_request: 8807
+author:
diff --git a/spec/services/system_note_service_spec.rb b/spec/services/system_note_service_spec.rb
index bd7269045e1..7913a180f9b 100644
--- a/spec/services/system_note_service_spec.rb
+++ b/spec/services/system_note_service_spec.rb
@@ -752,13 +752,13 @@ describe SystemNoteService, services: true do
       it 'sets the note text' do
         noteable.update_attribute(:time_estimate, 277200)
 
-        expect(subject.note).to eq "Changed time estimate of this issue to 1w 4d 5h"
+        expect(subject.note).to eq "changed time estimate to 1w 4d 5h"
       end
     end
 
     context 'without a time estimate' do
       it 'sets the note text' do
-        expect(subject.note).to eq "Removed time estimate on this issue"
+        expect(subject.note).to eq "removed time estimate"
       end
     end
   end
@@ -782,7 +782,7 @@ describe SystemNoteService, services: true do
       it 'sets the note text' do
         spend_time!(277200)
 
-        expect(subject.note).to eq "Added 1w 4d 5h of time spent on this merge request"
+        expect(subject.note).to eq "added 1w 4d 5h of time spent"
       end
     end
 
@@ -790,7 +790,7 @@ describe SystemNoteService, services: true do
       it 'sets the note text' do
         spend_time!(-277200)
 
-        expect(subject.note).to eq "Subtracted 1w 4d 5h of time spent on this merge request"
+        expect(subject.note).to eq "subtracted 1w 4d 5h of time spent"
       end
     end
 
@@ -798,7 +798,7 @@ describe SystemNoteService, services: true do
       it 'sets the note text' do
         spend_time!(:reset)
 
-        expect(subject.note).to eq "Removed time spent on this merge request"
+        expect(subject.note).to eq "removed time spent"
       end
     end