diff --git a/src/librustc_error_codes/error_codes/E0723.md b/src/librustc_error_codes/error_codes/E0723.md
index 394ee057b0b0c..95d47ab21cbd3 100644
--- a/src/librustc_error_codes/error_codes/E0723.md
+++ b/src/librustc_error_codes/error_codes/E0723.md
@@ -1,4 +1,4 @@
-An feature unstable in `const` contexts was used.
+An unstable feature in `const` contexts was used.
 
 Erroneous code example: