diff --git a/src/chunk_type.rs b/src/chunk_type.rs
index 84777a5..789b6c0 100644
--- a/src/chunk_type.rs
+++ b/src/chunk_type.rs
@@ -38,7 +38,7 @@ impl ChunkType {
         bytes
     }
 
-    fn is_valid(&self) -> bool {
+    pub fn is_valid(&self) -> bool {
         let mut x = self.bytes().len();
 
         loop {