diff --git a/README.md b/README.md
index e29c896aa..fce671098 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ Replace `<file1>`, `<file2>`, etc., with the paths to the source code files you
 You can also use additional command-line options to customize the behavior of the tool. The following options are available, along with their corresponding environment variable overrides:
 
 - `--history-file HISTORY_FILE`: Specify the history file (default: .aider.history). Override with the environment variable `AIDER_HISTORY_FILE`.
-- `--model MODEL`: Specify the model to use for the main chat (default: gpt-4). No environment variable override.
+- `--model MODEL`: Specify the model to use for the main chat (default: gpt-4). Override with the environment variable `AIDER_MODEL`.
 - `-3`: Use gpt-3.5-turbo model for the main chat (basically won't work). No environment variable override.
 - `--no-pretty`: Disable pretty, colorized output. Override with the environment variable `AIDER_PRETTY` (default: 1 for enabled, 0 for disabled).
 - `--apply FILE`: Apply the changes from the given file instead of running the chat. No environment variable override.