diff --git a/README.md b/README.md
index d909a72..562bb49 100644
--- a/README.md
+++ b/README.md
@@ -40,13 +40,13 @@ Implementation progress
 | 8.6.1.3 Composition Time to Sample Box             | ctts           |      - |
 | 8.6.1.4 Composition to Decode Box                  | cslg           |      - |
 | 8.6.2 Sync Sample Box                              | stss           |      - |
-| 8.6.3 Shadow Sync Sample Box                       | stsh           |      - |
+| 8.6.3 Shadow Sync Sample Box                       | stsh           |      - |
 | 8.6.4 Independent and Disposable Samples Box       | sdtp           |      - |
 | 8.6.5 Edit Box                                     | edts           |      - |
 | 8.6.6 Edit List Box                                | elst           |      - |
 | 8.7.1 Data Information Box                         | dinf           |      - |
 | 8.7.2 Data Reference Box                           | dref, url, urn |      - |
-| 8.7.3 Sample Size Boxes                            | stsz, stz2     |      - |
+| 8.7.3 Sample Size Boxes                            | stsz, stz2     |      - |
 | 8.7.4 Sample To Chunk Box                          | stsc           |      - |
 | 8.7.5 Chunk Offset Box                             | stco, co64     |      - |
 | 8.7.6 Padding Bits Box                             | padb           |      - |