diff --git a/hledger-lib/Hledger/Data/Valuation.hs b/hledger-lib/Hledger/Data/Valuation.hs
index 2c2ec534e..57b3f7e11 100644
--- a/hledger-lib/Hledger/Data/Valuation.hs
+++ b/hledger-lib/Hledger/Data/Valuation.hs
@@ -172,7 +172,7 @@ amountApplyValuation priceoracle styles periodlast mreportlast today ismultiperi
 
 -- | Standard error message for a report not supporting --value=then.
 unsupportedValueThenError :: String
-unsupportedValueThenError = "Sorry, --value=then is not yet implemented for this kind of report."
+unsupportedValueThenError = "Sorry, --value=then is not yet supported for this kind of report."
 
 -- | Find the market value of each component amount in the given
 -- commodity, or its default valuation commodity, at the given
diff --git a/hledger-lib/Hledger/Read/Common.hs b/hledger-lib/Hledger/Read/Common.hs
index bd7751926..977d037b8 100644
--- a/hledger-lib/Hledger/Read/Common.hs
+++ b/hledger-lib/Hledger/Read/Common.hs
@@ -466,7 +466,7 @@ datep' mYear = do
       let dateStr = show year ++ [sep1] ++ show month ++ [sep2] ++ show day
 
       when (sep1 /= sep2) $ customFailure $ parseErrorAtRegion startOffset endOffset $
-        "invalid date (mixing date separators is not allowed): " ++ dateStr
+        "invalid date: separators are different, should be the same"
 
       case fromGregorianValid year month day of
         Nothing -> customFailure $ parseErrorAtRegion startOffset endOffset $
@@ -846,7 +846,7 @@ fromRawNumber
   -> Either String
             (Quantity, Word8, Maybe Char, Maybe DigitGroupStyle)
 fromRawNumber (WithSeparators _ _ _) (Just _) =
-    Left "invalid number: mixing digit separators with exponents is not allowed"
+    Left "invalid number: digit separators and exponents may not be used together"
 fromRawNumber raw mExp = do
     (quantity, precision) <- toQuantity (fromMaybe 0 mExp) (digitGroup raw) (decimalGroup raw)
     return (quantity, precision, mDecPt raw, digitGroupStyle raw)
@@ -855,7 +855,7 @@ fromRawNumber raw mExp = do
     toQuantity e preDecimalGrp postDecimalGrp
       | precision < 0   = Right (Decimal 0 (digitGrpNum * 10^(-precision)), 0)
       | precision < 256 = Right (Decimal precision8 digitGrpNum, precision8)
-      | otherwise = Left "invalid number: numbers with more than 255 decimal digits are not allowed at this time"
+      | otherwise = Left "invalid number: numbers with more than 255 decimal places are currently not supported"
       where
         digitGrpNum = digitGroupNumber $ preDecimalGrp <> postDecimalGrp
         precision   = toInteger (digitGroupLength postDecimalGrp) - e
diff --git a/hledger/Hledger/Cli/Commands/Balance.hs b/hledger/Hledger/Cli/Commands/Balance.hs
index 093ad9430..1ecff4cf0 100644
--- a/hledger/Hledger/Cli/Commands/Balance.hs
+++ b/hledger/Hledger/Cli/Commands/Balance.hs
@@ -495,7 +495,7 @@ multiBalanceReportAsHtml ropts mbr =
 multiBalanceReportHtmlRows :: ReportOpts -> MultiBalanceReport -> (Html (), [Html ()], Maybe (Html ()))
 multiBalanceReportHtmlRows ropts mbr =
   let
-    headingsrow:rest | transpose_ ropts = error' "Sorry, --transpose is not supported with HTML output yet"  -- PARTIAL:
+    headingsrow:rest | transpose_ ropts = error' "Sorry, --transpose with HTML output is not yet supported"  -- PARTIAL:
                      | otherwise = multiBalanceReportAsCsv ropts mbr
     (bodyrows, mtotalsrow) | no_total_ ropts = (rest,      Nothing)
                            | otherwise       = (init rest, Just $ last rest)
diff --git a/hledger/Hledger/Cli/Utils.hs b/hledger/Hledger/Cli/Utils.hs
index 3373ed571..1f5e51d73 100644
--- a/hledger/Hledger/Cli/Utils.hs
+++ b/hledger/Hledger/Cli/Utils.hs
@@ -60,7 +60,7 @@ import Hledger.Utils
 
 -- | Standard error message for a bad output format specified with -O/-o.
 unsupportedOutputFormatError :: String -> String
-unsupportedOutputFormatError fmt = "Sorry, output format \""++fmt++"\" is unrecognised or not yet implemented for this report or report mode."
+unsupportedOutputFormatError fmt = "Sorry, output format \""++fmt++"\" is unrecognised or not yet supported for this kind of report."
 
 -- | Parse the user's specified journal file(s) as a Journal, maybe apply some
 -- transformations according to options, and run a hledger command with it.