diff --git a/website/docs/cli/commands/fmt.mdx b/website/docs/cli/commands/fmt.mdx
index a764bcf2c1..e8f1d6fd6f 100644
--- a/website/docs/cli/commands/fmt.mdx
+++ b/website/docs/cli/commands/fmt.mdx
@@ -57,5 +57,8 @@ The command-line flags are all optional. The following flags are available:
 * `-list=false` - Don't list the files containing formatting inconsistencies.
 * `-write=false` - Don't overwrite the input files. (This is implied by `-check` or when the input is STDIN.)
 * `-diff` - Display diffs of formatting changes.
+  * When using this flag, ensure that `diff` tool is installed. This is used internally for providing a better user experience.
 * `-check` - Check if the input is formatted. Exit status will be 0 if all input is properly formatted. If not, exit status will be non-zero and the command will output a list of filenames whose files are not properly formatted.
 * `-recursive` - Also process files in subdirectories. By default, only the given directory (or current directory) is processed.
+
+