diff --git a/hledger-ui/Hledger/UI/AccountsScreen.hs b/hledger-ui/Hledger/UI/AccountsScreen.hs
index d30975c4e..a4597432d 100644
--- a/hledger-ui/Hledger/UI/AccountsScreen.hs
+++ b/hledger-ui/Hledger/UI/AccountsScreen.hs
@@ -306,7 +306,7 @@ asHandle ui0@UIState{
         -- display mode/query toggles
         VtyEvent (EvKey (KChar 'H') []) -> asCenterAndContinue $ regenerateScreens j d $ toggleHistorical ui
         VtyEvent (EvKey (KChar 't') []) -> asCenterAndContinue $ regenerateScreens j d $ toggleTree ui
-        VtyEvent (EvKey (KChar 'Z') []) -> asCenterAndContinue $ regenerateScreens j d $ toggleEmpty ui
+        VtyEvent (EvKey (KChar c) []) | c `elem` ['z','Z'] -> asCenterAndContinue $ regenerateScreens j d $ toggleEmpty ui
         VtyEvent (EvKey (KChar 'R') []) -> asCenterAndContinue $ regenerateScreens j d $ toggleReal ui
         VtyEvent (EvKey (KChar 'U') []) -> asCenterAndContinue $ regenerateScreens j d $ toggleUnmarked ui
         VtyEvent (EvKey (KChar 'P') []) -> asCenterAndContinue $ regenerateScreens j d $ togglePending ui
diff --git a/hledger-ui/Hledger/UI/RegisterScreen.hs b/hledger-ui/Hledger/UI/RegisterScreen.hs
index ee2fa83ff..8d2c594f1 100644
--- a/hledger-ui/Hledger/UI/RegisterScreen.hs
+++ b/hledger-ui/Hledger/UI/RegisterScreen.hs
@@ -339,7 +339,7 @@ rsHandle ui@UIState{
         VtyEvent (EvKey (KChar 'V') []) -> rsCenterAndContinue $ regenerateScreens j d $ toggleValue ui
         VtyEvent (EvKey (KChar 'H') []) -> rsCenterAndContinue $ regenerateScreens j d $ toggleHistorical ui
         VtyEvent (EvKey (KChar 't') []) -> rsCenterAndContinue $ regenerateScreens j d $ toggleTree ui
-        VtyEvent (EvKey (KChar 'Z') []) -> rsCenterAndContinue $ regenerateScreens j d $ toggleEmpty ui
+        VtyEvent (EvKey (KChar c) []) | c `elem` ['z','Z'] -> rsCenterAndContinue $ regenerateScreens j d $ toggleEmpty ui
         VtyEvent (EvKey (KChar 'R') []) -> rsCenterAndContinue $ regenerateScreens j d $ toggleReal ui
         VtyEvent (EvKey (KChar 'U') []) -> rsCenterAndContinue $ regenerateScreens j d $ toggleUnmarked ui
         VtyEvent (EvKey (KChar 'P') []) -> rsCenterAndContinue $ regenerateScreens j d $ togglePending ui
diff --git a/hledger-ui/Hledger/UI/UIUtils.hs b/hledger-ui/Hledger/UI/UIUtils.hs
index e927f1a08..c3079ee83 100644
--- a/hledger-ui/Hledger/UI/UIUtils.hs
+++ b/hledger-ui/Hledger/UI/UIUtils.hs
@@ -125,7 +125,7 @@ helpDialog _copts =
                   ,renderKey ("/   ", "set a filter query")
                   ,renderKey ("F   ", "show future & periodic txns")
                   ,renderKey ("R   ", "show real/all postings")
-                  ,renderKey ("Z   ", "show nonzero/all amounts")
+                  ,renderKey ("z   ", "show nonzero/all amounts")
                   ,renderKey ("U/P/C ", "show unmarked/pending/cleared")
                   ,renderKey ("S-DOWN /S-UP  ", "shrink/grow period")
                   ,renderKey ("S-RIGHT/S-LEFT", "next/previous period")
diff --git a/hledger-ui/hledger-ui.m4.md b/hledger-ui/hledger-ui.m4.md
index 587351253..1bb30e0fc 100644
--- a/hledger-ui/hledger-ui.m4.md
+++ b/hledger-ui/hledger-ui.m4.md
@@ -225,7 +225,7 @@ and if you activate all three, the filter is removed.)
 
 `R` toggles real mode, in which [virtual postings](hledger.html#virtual-postings) are ignored.
 
-`Z` toggles nonzero mode, in which only accounts with nonzero balances
+`z` toggles nonzero mode, in which only accounts with nonzero balances
 are shown (hledger-ui shows zero items by default, unlike command-line
 hledger).
 
@@ -264,7 +264,7 @@ and if you activate all three, the filter is removed.)
 
 `R` toggles real mode, in which [virtual postings](hledger.html#virtual-postings) are ignored.
 
-`Z` toggles nonzero mode, in which only transactions posting a nonzero
+`z` toggles nonzero mode, in which only transactions posting a nonzero
 change are shown (hledger-ui shows zero items by default,
 unlike command-line hledger).