diff --git a/src/machi.proto b/src/machi.proto
index f59e293..2fd70a3 100644
--- a/src/machi.proto
+++ b/src/machi.proto
@@ -40,6 +40,11 @@ enum Mpb_GeneralStatusCode {
      BAD_ARG = 1;
      WEDGED = 2;
      BAD_CHECKSUM = 3;
+     /*
+     ** There is no timout error code, only PARTITION.  If the client
+     ** wants to know if a lot of time has elapsed, then the client
+     ** can do its own timekeeping.
+     */
      PARTITION = 4;
      NOT_WRITTEN = 5;
      WRITTEN = 6;
@@ -188,11 +193,13 @@ message Mpb_ReadChunkReq {
     required uint64 offset = 2;
     required uint32 size = 3;
 
-    // Use flag_checksum=non-zero to request the chunk's checksum also
-    optional uint32 flag_checksum = 4 [default=0];
+    // Use flag_no_checksum=non-zero to skip returning the chunk's checksum.
+    // TODO: not implemented yet.
+    optional uint32 flag_no_checksum = 4 [default=0];
 
     // Use flag_no_chunk=non-zero to skip returning the chunk (which
-    // only makes sense if flag_checksum is set).
+    // only makes sense if flag_no_checksum is not set).
+    // TODO: not implemented yet.
     optional uint32 flag_no_chunk = 5 [default=0];
 }
 
@@ -385,11 +392,13 @@ message Mpb_LL_ReadChunkReq {
     required uint64 offset = 3;
     required uint32 size = 4;
 
-    // Use flag_checksum=non-zero to request the chunk's checksum also
-    optional uint32 flag_get_checksum = 5 [default=0];
+    // Use flag_no_checksum=non-zero to skip returning the chunk's checksum.
+    // TODO: not implemented yet.
+    optional uint32 flag_no_checksum = 5 [default=0];
 
     // Use flag_no_chunk=non-zero to skip returning the chunk (which
-    // only makes sense if flag_checksum is set).
+    // only makes sense if flag_checksum is not set).
+    // TODO: not implemented yet.
     optional uint32 flag_no_chunk = 6 [default=0];
 }
 
diff --git a/src/machi_pb_translate.erl b/src/machi_pb_translate.erl
index bbb9951..2bac149 100644
--- a/src/machi_pb_translate.erl
+++ b/src/machi_pb_translate.erl
@@ -76,10 +76,10 @@ from_pb_request(#mpb_ll_request{
                      file=File,
                      offset=Offset,
                      size=Size,
-                     flag_get_checksum=PB_GetChecksum,
+                     flag_no_checksum=PB_GetNoChecksum,
                      flag_no_chunk=PB_GetNoChunk}}) ->
     EpochID = conv_to_epoch_id(PB_EpochID),
-    Opts = [{get_checksum, conv_to_boolean(PB_GetChecksum)},
+    Opts = [{no_checksum, conv_to_boolean(PB_GetNoChecksum)},
             {no_chunk, conv_to_boolean(PB_GetNoChunk)}],
     {ReqID, {low_read_chunk, EpochID, File, Offset, Size, Opts}};
 from_pb_request(#mpb_ll_request{