diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21d54a0..5ccda94 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Fix some typos
+
 ## [1.2.0] - 2024-01-11
 
 ### Added
diff --git a/src/ipl3checksum/frontends/sum.py b/src/ipl3checksum/frontends/sum.py
index eca1a0f..2672e48 100644
--- a/src/ipl3checksum/frontends/sum.py
+++ b/src/ipl3checksum/frontends/sum.py
@@ -58,12 +58,12 @@ def processArguments(args: argparse.Namespace):
     exit(doSum(romBytes, kindName, update, outputPath))
 
 def addSubparser(subparser: argparse._SubParsersAction[argparse.ArgumentParser]):
-    parser = subparser.add_parser("sum", help="Calculates the ipl3 checksum of a big endian ROM by detecting the CIC it uses.")
+    parser = subparser.add_parser("sum", help="Calculates the ipl3 checksum of a big endian ROM by detecting the CIC it uses and optionally update it.")
 
     parser.add_argument("rom_path", help="Path to a big endian ROM file", type=Path)
 
-    parser.add_argument("-k", "-c", "--kind", "--cic", help="Used this variant to calculate the checksum instead of automatically detecting which kind the ROM uses", dest="kind", metavar="KIND", choices=ipl3checksum.CICKind.validNames())
-    parser.add_argument("-u", "--update", help="Updates the ROM with the calculated checksum. This option modified the input rom unless `--output` is used", action="store_true")
+    parser.add_argument("-k", "-c", "--kind", "--cic", help="Use this variant to calculate the checksum instead of automatically detecting which kind the ROM uses", dest="kind", metavar="KIND", choices=ipl3checksum.CICKind.validNames())
+    parser.add_argument("-u", "--update", help="Updates the ROM with the calculated checksum. This option modifies the input rom unless `--output` is used", action="store_true")
     parser.add_argument("-o", "--output", help="Path to write the updated ROM. This option is ignored if `--update` is not used", type=Path)
 
     parser.set_defaults(func=processArguments)