diff --git a/lambdabot-reference-plugins.cabal b/lambdabot-reference-plugins.cabal
--- a/lambdabot-reference-plugins.cabal
+++ b/lambdabot-reference-plugins.cabal
@@ -1,11 +1,11 @@
 name:                   lambdabot-reference-plugins
-version:                5.3
+version:                5.3.0.2
 
 license:                GPL
 license-file:           LICENSE
 
 author:                 Don Stewart
-maintainer:             James Cook <mokus@deepbondi.net>
+maintainer:             Bertram Felgenhauer <int-e@gmx.de>
 
 category:               Development, Web
 synopsis:               Lambdabot reference plugins.
@@ -34,7 +34,7 @@
 
 build-type:             Simple
 cabal-version:          >= 1.10
-tested-with:            GHC == 8.2.2, GHC == 8.4.4, GHC == 8.6.5, GHC == 8.8.3
+tested-with:            GHC == 8.2.2, GHC == 8.4.4, GHC == 8.6.5, GHC == 8.8.4, GHC == 8.10.4
 
 source-repository head
   type:                 git
diff --git a/src/Lambdabot/Plugin/Reference/Where.hs b/src/Lambdabot/Plugin/Reference/Where.hs
--- a/src/Lambdabot/Plugin/Reference/Where.hs
+++ b/src/Lambdabot/Plugin/Reference/Where.hs
@@ -69,6 +69,10 @@
         Just x  -> P.unpack x
 
 updateWhere :: Bool -> WhereState -> WhereWriter -> String -> String -> Cmd Where String
-updateWhere _guard factFM writer fact dat = do
+updateWhere _guard factFM writer fact dat
+    | null dat = do
+        writer $ M.delete (P.pack fact) factFM
+        return "It is forgotten."
+    | otherwise = do
         writer $ M.insert (P.pack fact) (P.pack dat) factFM
         randomSuccessMsg