diff --git a/README.md b/README.md
index 8e91b52..3df1ae7 100644
--- a/README.md
+++ b/README.md
@@ -31,9 +31,9 @@ optional arguments:
   -j, --json            format output as JSON
   --exclude-fuzzy       select only files without fuzzy entries
   --exclude-reserved    select only files that aren't reserved
-  --only-reserved       Will print out only reserved files
+  --only-reserved       select only only reserved files
   --show-reservation-dates
-                        show issue creation dates 
+                        show issue creation dates
   --version             show program's version number and exit
 ```
 
diff --git a/potodo/potodo.py b/potodo/potodo.py
index 00b0324..0cb566a 100644
--- a/potodo/potodo.py
+++ b/potodo/potodo.py
@@ -366,7 +366,7 @@ def main() -> None:
         "--only-reserved",
         action="store_true",
         dest="only_reserved",
-        help="Will print out only reserved files",
+        help="select only only reserved files",
     )
 
     parser.add_argument(
@@ -388,5 +388,9 @@ def main() -> None:
         print("Cannot pass --exclude-fuzzy and --only-fuzzy at the same time")
         exit(1)
 
+    if args.get("exclude_reserved") and args.get("only_reserved"):
+        print("Cannot pass --exclude-reserved and --only-reserved at the same time")
+        exit(1)
+
     # Launch the processing itself
     exec_potodo(**args)