diff --git a/PluralKit.Bot/Commands/GroupMember.cs b/PluralKit.Bot/Commands/GroupMember.cs
index f3522df1..658f75fc 100644
--- a/PluralKit.Bot/Commands/GroupMember.cs
+++ b/PluralKit.Bot/Commands/GroupMember.cs
@@ -86,10 +86,22 @@ public class GroupMember
     {
         ctx.CheckOwnGroup(target);
 
-        var members = (await ctx.ParseMemberList(ctx.System.Id))
+        List<MemberId> members;
+        if (ctx.MatchFlag("all", "a"))
+        {
+            members = (await ctx.Database.Execute(conn => conn.QueryMemberList(target.System,
+                    new DatabaseViewsExt.ListQueryOptions { })))
+                .Select(m => m.Id)
+                .Distinct()
+                .ToList();
+        }
+        else
+        {
+            members = (await ctx.ParseMemberList(ctx.System.Id))
             .Select(m => m.Id)
             .Distinct()
             .ToList();
+        }
 
         var existingMembersInGroup = (await ctx.Database.Execute(conn => conn.QueryMemberList(target.System,
                 new DatabaseViewsExt.ListQueryOptions { GroupFilter = target.Id })))
diff --git a/docs/content/tips-and-tricks.md b/docs/content/tips-and-tricks.md
index 374ba566..2385ab70 100644
--- a/docs/content/tips-and-tricks.md
+++ b/docs/content/tips-and-tricks.md
@@ -77,6 +77,7 @@ You cannot look up private members or groups of another system.
 |pk;system frontpercent|-flat||Show "flat" frontpercent - percentages add up to 100%|
 |pk;group \<group> frontpercent|-fronters-only|-fo|Show a group's frontpercent without the "no fronter" entry|
 |pk;group \<group> frontpercent|-flat||Show "flat" frontpercent - percentages add up to 100%|
+|pk;group \<group> \<add/remove>|-all|-a|Add or remove all members from a group.|
 |pk;edit|-append|-a|Append the new content to the old message instead of overwriting it|
 |pk;edit|-prepend|-p|Prepend the new content to the old message instead of overwriting it|
 |pk;edit|-nospace|-ns|Append/prepend without adding a space|