diff --git a/src/App/Page/Zone.purs b/src/App/Page/Zone.purs
index 6040f09..ed5c42b 100644
--- a/src/App/Page/Zone.purs
+++ b/src/App/Page/Zone.purs
@@ -560,7 +560,8 @@ render state
           , Bulma.selection_field "idDMARCaspf" "Consistency Policy for SPF"   DMARC_aspf  DMARC.consistency_policies_txt_spf  (maybe "-" show state.dmarc.aspf)
 
           , Bulma.hr
-          , Bulma.box_input "idDMARCpct" "% of dropped emails" "100" DMARC_pct (maybe "100" show state.dmarc.pct)
+          , Bulma.div_content [Bulma.explanation Explanations.dmarc_pct]
+          , Bulma.box_input "idDMARCpct" "Sample rate [0..100]" "100" DMARC_pct (maybe "100" show state.dmarc.pct)
 
           , Bulma.hr
           , Bulma.selection_field "idDMARCfo" "When to send a report" DMARC_fo DMARC.report_occasions_txt (maybe "-" show state.dmarc.fo)
@@ -580,6 +581,7 @@ render state
                         ] []
 
           , Bulma.hr
+          , Bulma.div_content [Bulma.explanation Explanations.dmarc_ri]
           , Bulma.box_input "idDMARCri" "Report interval (in seconds)" "86400" DMARC_ri (maybe "0" show state.dmarc_ri)
           ]
 
diff --git a/src/App/Text/Explanations.purs b/src/App/Text/Explanations.purs
index c63b088..8515951 100644
--- a/src/App/Text/Explanations.purs
+++ b/src/App/Text/Explanations.purs
@@ -234,6 +234,22 @@ dmarc_contact =
     """
   ]
 
+dmarc_ri :: forall w i. Array (HH.HTML w i)
+dmarc_ri =
+  [ Bulma.p """
+    Requested report interval. Default is 86400.
+    """
+  ]
+
+dmarc_pct :: forall w i. Array (HH.HTML w i)
+dmarc_pct =
+  [ Bulma.p """
+    Sampling rate.
+    Percentage of messages subjected to the requested policy.
+    """
+  ]
+
+
 dkim_default_algorithms :: forall w i. Array (HH.HTML w i)
 dkim_default_algorithms =
   [ Bulma.p """
diff --git a/src/App/Type/DMARC.purs b/src/App/Type/DMARC.purs
index 8360ab5..0d1d88b 100644
--- a/src/App/Type/DMARC.purs
+++ b/src/App/Type/DMARC.purs
@@ -28,7 +28,7 @@ type DMARC
     -- | v= Required. Default is "DMARC1", so the implementation doesn't actually require it.
     , v :: Maybe Version
 
-    -- | pct= Optional. Percentage of messages to filter [0...100], 100 by default.
+    -- | pct= Optional. Percentage of messages subjected to the requested policy [0...100], 100 by default.
     , pct :: Maybe Int
 
     -- | p= Required. Requested Mail Receiver policy (None, Quarantine, Reject).