diff --git a/README.md b/README.md
index 08a37dd..bb7767f 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ jobs:
 
 - `region`: (Optional) [Region](https://cloud.google.com/functions/docs/locations) in which the function should be deployed. Defaults to `us-central1`.
 
-- `env_vars`: (Optional) List of key-value pairs to set as environment variables in the format: `KEY1=VALUE1,KEY2=VALUE2`. All existing environment variables will be removed, even if this parameter is not passed.
+- `env_vars`: (Optional) List of key-value pairs to set as environment variables in the format: `KEY1=VALUE1,KEY2=VALUE2`. All existing environment variables will be removed, even if this parameter is not passed. Keys or values that contain a separator must be escaped with a backslash (`\,`, `\\n`). All leading and trailing whitespace is trimmed.
 
 - `env_vars_file`: (Optional) Path to a local YAML file with definitions for all environment variables. An example env_vars_file can be found [here](tests/env-var-files/test.good.yaml). All existing environment variables will be removed, even if this parameter is not passed. If `env_vars` is also given, values in `env_vars` take precendence over these values.