diff --git a/offapi/com/sun/star/report/XGroup.idl b/offapi/com/sun/star/report/XGroup.idl
index 9fb409b6279a..65285cf820e9 100644
--- a/offapi/com/sun/star/report/XGroup.idl
+++ b/offapi/com/sun/star/report/XGroup.idl
@@ -109,7 +109,7 @@ interface XGroup
     */
     [attribute,readonly] com::sun::star::report::XGroups Groups;
 
-    /** Defines either a column name or a expression.
+    /** Defines either a column name or an expression.
     */
     [attribute,bound] string Expression;