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diff --git a/compiler/rustc_error_codes/src/error_codes/E0730.md b/compiler/rustc_error_codes/src/error_codes/E0730.md
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+An array without a fixed length was pattern-matched.
+
+Erroneous code example:
+
+```compile_fail,E0730
+fn is_123<const N: usize>(x: [u32; N]) -> bool {
+    match x {
+        [1, 2, ..] => true, // error: cannot pattern-match on an
+                            //        array without a fixed length
+        _ => false
+    }
+}
+```
+
+To fix this error, you have two solutions:
+ 1. Use an array with a fixed length.
+ 2. Use a slice.
+
+Example with an array with a fixed length:
+
+```
+fn is_123(x: [u32; 3]) -> bool { // We use an array with a fixed size
+    match x {
+        [1, 2, ..] => true, // ok!
+        _ => false
+    }
+}
+```
+
+Example with a slice:
+
+```
+fn is_123(x: &[u32]) -> bool { // We use a slice
+    match x {
+        [1, 2, ..] => true, // ok!
+        _ => false
+    }
+}
+```