diff --git a/README.md b/README.md
index 95a577c..62ff836 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ This table lists photometric interpretations and sample formats which are suppor
 | LZW      | ✓        | ✓        |
 | Deflate  | ✓        | ✓        |
 | PackBits | ✓        | ✓        |
-| Fax      | ✓        | not yet  |
+| Fax4     | ✓        | not yet  |
 | JPEG     | ✓        | not yet  |
 | ZSTD     | ✓        | not yet  |