diff --git a/doc/man/s3fs.1 b/doc/man/s3fs.1
index 2965f81..1d993fc 100644
--- a/doc/man/s3fs.1
+++ b/doc/man/s3fs.1
@@ -263,7 +263,7 @@ that they did not create.
 Allow S3 server to check data integrity of uploads via the Content-MD5 header.
 This can add CPU overhead to transfers.
 \fB\-o\fR enable_unsigned_payload (default is disable)
-Do not calculate Content-SHA25 for PutObject and UploadPart
+Do not calculate Content-SHA256 for PutObject and UploadPart
 payloads.  This can reduce CPU overhead to transfers.
 .TP
 \fB\-o\fR ecs (default is disable)
diff --git a/src/s3fs_help.cpp b/src/s3fs_help.cpp
index bd79823..30ce0bd 100644
--- a/src/s3fs_help.cpp
+++ b/src/s3fs_help.cpp
@@ -319,7 +319,7 @@ static const char help_string[] =
     "      Content-MD5 header.  This can add CPU overhead to transfers.\n"
     "\n"
     "   enable_unsigned_payload (default is disable)\n"
-    "      - Do not calculate Content-SHA25 for PutObject and UploadPart\n"
+    "      - Do not calculate Content-SHA256 for PutObject and UploadPart\n"
     "      payloads.  This can reduce CPU overhead to transfers.\n"
     "\n"
     "   ecs (default is disable)\n"