diff --git a/datafusion/src/lib.rs b/datafusion/src/lib.rs
index 4f4cd664fd413..df9efafaeb383 100644
--- a/datafusion/src/lib.rs
+++ b/datafusion/src/lib.rs
@@ -197,14 +197,12 @@
 //!
 //! cargo run --example csv_sql
 //!
-//! cargo run --example parquet_sql
+//! PARQUET_TEST_DATA=./parquet-testing/data cargo run --example parquet_sql
 //!
 //! cargo run --example dataframe
 //!
 //! cargo run --example dataframe_in_memory
 //!
-//! cargo run --example parquet_sql
-//!
 //! cargo run --example simple_udaf
 //!
 //! cargo run --example simple_udf