diff --git a/src/bin/headers.rs b/src/bin/headers.rs
index 497da3a..2efe5a3 100644
--- a/src/bin/headers.rs
+++ b/src/bin/headers.rs
@@ -18,7 +18,7 @@ fn main() -> io::Result<()> {
             None => eprintln!("Invalid parameters")
         }
     } else {
-        eprintln!("Doby format not recognized.");
+        eprintln!("doby format not recognized.");
     }
     Ok(())
 }
\ No newline at end of file
diff --git a/src/cli.rs b/src/cli.rs
index 657e558..ca2a1a8 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -181,7 +181,7 @@ fn number<T: FromStr>(val: &str) -> Option<T> {
     match val.parse::<T>() {
         Ok(n) => Some(n),
         Err(_) => {
-            eprintln!("Cannot parse '{}' to '{}'", val, std::any::type_name::<T>());
+            eprintln!("Error: '{}' is not a number", val);
             None
         }
     }
diff --git a/src/lib.rs b/src/lib.rs
index ecc24c4..5d8fc79 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -21,7 +21,7 @@ impl WrappedPassword {
                 } else {
                     password.zeroize();
                     password_confirm.zeroize();
-                    eprintln!("Passwords don't match");
+                    eprintln!("Error: passwords don't match");
                     None
                 }
             } else {
diff --git a/src/main.rs b/src/main.rs
index c0cd392..cf7707a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -40,7 +40,7 @@ fn run() -> bool {
                                         }
                                     }
                                 } else {
-                                    eprintln!("Invalid parameters")
+                                    eprintln!("Error: invalid encryption parameters")
                                 }
                             }
                             Err(e) => eprintln!("I/O error while reading headers: {}", e)