diff --git a/SC3021.md b/SC3021.md
index 0969f58..af100e9 100644
--- a/SC3021.md
+++ b/SC3021.md
@@ -1,2 +1,9 @@
 ## In POSIX sh, `>&` is undefined.
-See similar warning [[SC3020]]
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+
+This warning was retracted after 0.8.0.
+
+There are two forms of this operator: `>& fd`, and `>& filename`. The former is POSIX, and copies stdout to the given file descriptor or fails if it's not an integer. The latter is a bash specific extension meaning `> filename 2>&1`. Bash will interpret `>& $var` as one or the other depending on whether the value is an integer.
+
+ShellCheck 0.8.0 and below was unable to differentiate and unintentionally treated both as `>& filename`, causing an invalid warning when the value was an integer.
+
+If your script uses `>&` with an integer to copy a file descriptor, please ignore this warning. If it uses it to write both stdout and stderr to a filename, like `&>`, rewrite it explicitly to `> file 2>&1`. 
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