diff --git a/integrations/pgvector/src/haystack_integrations/document_stores/pgvector/document_store.py b/integrations/pgvector/src/haystack_integrations/document_stores/pgvector/document_store.py
index a02c46200..1b1333f5c 100644
--- a/integrations/pgvector/src/haystack_integrations/document_stores/pgvector/document_store.py
+++ b/integrations/pgvector/src/haystack_integrations/document_stores/pgvector/document_store.py
@@ -96,7 +96,11 @@ def __init__(
         A specific table to store Haystack documents will be created if it doesn't exist yet.
 
         :param connection_string: The connection string to use to connect to the PostgreSQL database, defined as an
-            environment variable, e.g.: `PG_CONN_STR="postgresql://USER:PASSWORD@HOST:PORT/DB_NAME"`
+            environment variable. It can be provided in either URI format
+            e.g.: `PG_CONN_STR="postgresql://USER:PASSWORD@HOST:PORT/DB_NAME"`, or keyword/value format
+            e.g.: `PG_CONN_STR="host=HOST port=PORT dbname=DBNAME user=USER password=PASSWORD"`
+            See [PostgreSQL Documentation](https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING)
+            for more details.
         :param table_name: The name of the table to use to store Haystack documents.
         :param language: The language to be used to parse query and document content in keyword retrieval.
             To see the list of available languages, you can run the following SQL query in your PostgreSQL database: