diff --git a/README.md b/README.md
index 31f8ddf..bc93154 100644
--- a/README.md
+++ b/README.md
@@ -54,10 +54,22 @@ Iterate over subset of database content:
 
 ## Compiling with optimizations
 
-This library can be compiled with the following optimization options. By default these are disabled. Provide the following nim compiler flags to enable them:
+CMake is used during compilation to determine which of the following optimization options are enabled. You can set the following nim compiler flags to 0 or 1 to override them:
  - fdatasync from <unistd.h> `--passC:-DHAVE_FDATASYNC=1`
  - F_FULLSYNC from <fcntl.h> `--passC:-DHAVE_FULLFSYNC=1`
  - O_CLOEXEC from <fcntl.h> `--passC:-DHAVE_O_CLOEXEC=1`
  - crc32c from <crc32c/crc32c.h> `--passC:-DHAVE_CRC32C=1`
  - snappy from <snappy.h> `--passC:-DHAVE_SNAPPY=1`
  - zstd from <zstd.h> `--passC:-DHAVE_ZSTD=1`
+
+## Updating
+
+When you want to update this library to a new version of LevelDB, follow these steps:
+- Update LevelDB submodule to new version.
+- Run 'build.sh'.
+- Run 'nimble build' and 'nimble test'.
+- Make sure everything's working.
+- Increment version of this library in 'leveldbstatic.nimble'.
+- Commit the changes.
+- Tag the commit with the new version number.
+- Push.