diff --git a/src/codec.rs b/src/codec.rs
index 723dc0a..91d65c1 100644
--- a/src/codec.rs
+++ b/src/codec.rs
@@ -8,8 +8,8 @@ use crate::{
     command::{Command, ParamBuffer, Params, Response},
 };
 
-const RETURN_CODE: u8 = b'\r';
-const PARAM_DELIMITER: u8 = b',';
+pub(crate) const RETURN_CODE: u8 = b'\r';
+pub(crate) const PARAM_DELIMITER: u8 = b',';
 
 #[derive(Clone, Debug)]
 pub struct Codec {
@@ -38,7 +38,7 @@ where
         dst.extend_from_slice(Cmd::TEXT);
         params.serialize_to(ParamBuffer::new(dst));
 
-        dst.put_u8(b'\r');
+        dst.put_u8(RETURN_CODE);
 
         Ok(())
     }
diff --git a/src/command/mod.rs b/src/command/mod.rs
index d3866b7..900a581 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -10,6 +10,8 @@ pub(crate) use macros::{command, range_param, range_response};
 pub(crate) use no_params::NoParams;
 pub use ok_response::{OkResponse, OkResponseError};
 
+use crate::codec::PARAM_DELIMITER;
+
 pub trait Command {
     const TEXT: &'static [u8];
     type Params: Params;
@@ -40,7 +42,7 @@ impl<'a> ParamBuffer<'a> {
     }
 
     fn serialize_param(&mut self, bytes: &[u8]) {
-        self.0.put_u8(b',');
+        self.0.put_u8(PARAM_DELIMITER);
         self.0.extend_from_slice(bytes);
     }
 }