readme.md

@@ -80,6 +80,19 @@ https://github.com/protocolbuffers/protobuf/releases/download/v3.17.1/protobuf-a
 
 If you can run `./protobuf/build.sh` without errors, you have `go` and `protoc` installed correctly. 
 
+On Linux you probably need to instead the open file limits
+
+```
+ulimit -n 1000000
+sysctl -w fs.file-max=1000000
+```
+
+and `/etc/security/limits.conf` or `/etc/sysctl.conf` change:
+
+```
+fs.file-max = 1000000
+```
+
 Finally, run the block processor as described under Usage.
 
 ### Running from Source