diff --git a/src/archive/zip/struct.go b/src/archive/zip/struct.go
index 867dd5cb7a..3ebf39f5a6 100644
--- a/src/archive/zip/struct.go
+++ b/src/archive/zip/struct.go
@@ -143,9 +143,9 @@ type FileHeader struct {
 	// Deprecated: Use CompressedSize64 instead.
 	CompressedSize uint32
 
-	// UncompressedSize is the compressed size of the file in bytes.
+	// UncompressedSize is the uncompressed size of the file in bytes.
 	// If either the uncompressed or compressed size of the file
-	// does not fit in 32 bits, CompressedSize is set to ^uint32(0).
+	// does not fit in 32 bits, UncompressedSize is set to ^uint32(0).
 	//
 	// Deprecated: Use UncompressedSize64 instead.
 	UncompressedSize uint32