diff --git a/README.md b/README.md
index 327bad9..7b4ceb7 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Config format:
 ```toml
 [snapshot]
     mode         = "file"           # indicates output mode <postgres | file>
-    workers      = 4                # degree of concurrency, the state trie is subdivided into sections that are traversed and processed concurrently
+    workers      = 4                # degree of concurrency: the state trie is subdivided into sections that are traversed and processed concurrently
     blockHeight  = -1               # blockheight to perform the snapshot at (-1 indicates to use the latest blockheight found in leveldb)
     recoveryFile = "recovery_file"  # specifies a file to output recovery information on error or premature closure
     accounts = []                   # list of accounts (addresses) to take the snapshot for # SNAPSHOT_ACCOUNTS
@@ -65,6 +65,12 @@ Config format:
     genesisBlock = "0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3" # ETH_GENESIS_BLOCK
 ```
 
+> **Note:** previous versions of this service used different variable names. To update, change the following:
+> * `LVL_DB_PATH` => `LEVELDB_PATH`
+> * `ANCIENT_DB_PATH` => `LEVELDB_ANCIENT`
+> * `LOGRUS_LEVEL`, `LOGRUS_FILE` => `LOG_LEVEL`, `LOG_FILE`, etc.
+
+
 ## Usage
 
 * For state snapshot from LevelDB: