diff --git a/src/ui/effect.rs b/src/ui/effect.rs
index 7617632..adfca98 100644
--- a/src/ui/effect.rs
+++ b/src/ui/effect.rs
@@ -6,6 +6,8 @@ use crate::view::Axis;
 
 use super::app::{App, AppMode};
 
+pub(crate) const RECORD_COORDS_CANNOT_BE_EMPTY: &str = "Record coordinates cannot be empty";
+
 /// A discrete state change produced by a command.
 /// Effects know how to apply themselves to the App.
 pub trait Effect: Debug {
@@ -459,7 +461,7 @@ impl Effect for ApplyAndClearDrill {
                 app.model.set_cell(orig_key.clone(), value);
             } else {
                 if new_value.is_empty() {
-                    app.status_msg = "Record coordinates cannot be empty".to_string();
+                    app.status_msg = RECORD_COORDS_CANNOT_BE_EMPTY.to_string();
                     continue;
                 }
                 // Rename a coordinate: remove old cell, insert new with updated coord