diff --git a/redbot/cogs/filter/filter.py b/redbot/cogs/filter/filter.py
index daf1769df..53ef2fee0 100644
--- a/redbot/cogs/filter/filter.py
+++ b/redbot/cogs/filter/filter.py
@@ -183,7 +183,7 @@ class Filter(commands.Cog):
         except discord.Forbidden:
             await ctx.send(_("I can't send direct messages to you."))
 
-    @_filter_channel.command("add")
+    @_filter_channel.command(name="add", require_var_positional=True)
     async def filter_channel_add(self, ctx: commands.Context, *words: str):
         """Add words to the filter.
 
@@ -205,7 +205,7 @@ class Filter(commands.Cog):
         else:
             await ctx.send(_("Words already in the filter."))
 
-    @_filter_channel.command("remove")
+    @_filter_channel.command(name="delete", aliases=["remove", "del"], require_var_positional=True)
     async def filter_channel_remove(self, ctx: commands.Context, *words: str):
         """Remove words from the filter.
 
@@ -227,7 +227,7 @@ class Filter(commands.Cog):
         else:
             await ctx.send(_("Those words weren't in the filter."))
 
-    @_filter.command(name="add")
+    @_filter.command(name="add", require_var_positional=True)
     async def filter_add(self, ctx: commands.Context, *words: str):
         """Add words to the filter.
 
@@ -249,7 +249,7 @@ class Filter(commands.Cog):
         else:
             await ctx.send(_("Those words were already in the filter."))
 
-    @_filter.command(name="delete", aliases=["remove", "del"])
+    @_filter.command(name="delete", aliases=["remove", "del"], require_var_positional=True)
     async def filter_remove(self, ctx: commands.Context, *words: str):
         """Remove words from the filter.