diff --git a/README.md b/README.md
index 88a1f58cf..e311d5466 100644
--- a/README.md
+++ b/README.md
@@ -137,9 +137,9 @@ This will show the list of validation options.
 ```
   -ca, --cache TEXT               Relative path to cache files containing pre
                                   loaded metadata and rules
-  -ps, --pool-size INTEGER        Number of parallel processes for validation
-  -dep, --dotenv-path             Path to the .env file used to set environment variables.
-  -d, --data TEXT                 Path to directory containing data files.
+  -ps, --pool-size INTEGER         Number of parallel processes for validation
+   -dep, --dotenv-path             Path to the .env file used to set environment variables.
+  -d, --data TEXT                 Path to directory containing data files. Should only be provided once. If provided more than once, only the last value will be recorded.
   -dp, --dataset-path TEXT        Absolute path to dataset file. Can be specified multiple times.
   -dxp, --define-xml-path TEXT    Path to Define-XML. DEFINE_XML environment variable can be used to pass value.
   -l, --log-level [info|debug|error|critical|disabled|warn]
diff --git a/core.py b/core.py
index e51ddeb35..e6add635f 100644
--- a/core.py
+++ b/core.py
@@ -320,7 +320,8 @@ def load_custom_dotenv_from_data_options(ctx, param, value):
     "-d",
     "--data",
     required=False,
-    help=f"Path to directory containing data files ({VALIDATION_FORMATS_MESSAGE})",
+    help=f"Path to directory containing data files ({VALIDATION_FORMATS_MESSAGE}). "
+    "Should be provided once. If provided more than once, only the last value will be recorded",
     callback=load_custom_dotenv_from_data_options,
 )
 @click.option(