diff --git a/man/sd_bus_slot_set_floating.xml b/man/sd_bus_slot_set_floating.xml
index 9cb4b8a441..cae1f5353c 100644
--- a/man/sd_bus_slot_set_floating.xml
+++ b/man/sd_bus_slot_set_floating.xml
@@ -29,7 +29,7 @@
 
       <funcprototype>
         <funcdef>int <function>sd_bus_slot_set_floating</function></funcdef>
-        <paramdef>sd_bus_slot *<parameter>bus</parameter></paramdef>
+        <paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef>
         <paramdef>int <parameter>b</parameter></paramdef>
       </funcprototype>
 
@@ -81,6 +81,12 @@
     <para>Returned errors may indicate the following problems:</para>
 
     <variablelist>
+      <varlistentry>
+        <term><constant>-EINVAL</constant></term>
+
+        <listitem><para>The <parameter>slot</parameter> parameter is <constant>NULL</constant>.</para></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><constant>-ECHILD</constant></term>