diff --git a/lib/src/german/DocumentationGerFunctor.gf b/lib/src/german/DocumentationGerFunctor.gf
index f9e9ed753..5bfac975c 100644
--- a/lib/src/german/DocumentationGerFunctor.gf
+++ b/lib/src/german/DocumentationGerFunctor.gf
@@ -64,7 +64,7 @@ lin
 
   InflectionAdv adv = {
     t  = "adverb" ;
-    s1 = heading1 (heading preposition_Category) ;
+    s1 = heading1 (heading adverb_Category) ;
     s2 = paragraph adv.s
     } ;
 
diff --git a/lib/src/german/TerminologyGer.gf b/lib/src/german/TerminologyGer.gf
index 59922d259..569acd925 100644
--- a/lib/src/german/TerminologyGer.gf
+++ b/lib/src/german/TerminologyGer.gf
@@ -23,6 +23,7 @@ lin
   noun_Category = mkN "Substantiv" ;
   adjective_Category = mkN "Adjektiv" ;
   verb_Category = mkN "Verb" ;
+  adverb_Category = mkN "Adverb" ;
   preposition_Category = mkN "Präposition" ;
 
   gender_ParameterType = mkN "Geschlecht" ;