diff --git a/src/uu/du/src/du.rs b/src/uu/du/src/du.rs
index b0778cbec..c06205974 100644
--- a/src/uu/du/src/du.rs
+++ b/src/uu/du/src/du.rs
@@ -913,6 +913,8 @@ impl FromStr for Threshold {
         let size = parse_size(&s[offset..])?;
 
         if s.starts_with('-') {
+				// Threshold of '-0' excludes everything besides 0 sized entries
+				// GNU's du threats '-0' as an invalid argument
             if size == 0 {
                 return Err(ParseSizeError::ParseFailure(s.to_string()));
             }