diff --git a/API.md b/API.md
index 1dd3531..73c7479 100644
--- a/API.md
+++ b/API.md
@@ -256,7 +256,7 @@ data | string | required | The data needs to be signed.
 
 ## Note
 * __CRL__:loudspeaker: Certificate Revocation List
-* __DDS__:loudspeaker: Document Security Store
+* __DSS__:loudspeaker: Document Security Store
 * __DocMDP__:loudspeaker: Document Modification Detection and Prevention
 * __LTV__:loudspeaker: Long-Term Validation
 * __OCSP__:loudspeaker: Online Certificate Status Protocol