diff --git a/crates/polars-lazy/src/scan/csv.rs b/crates/polars-lazy/src/scan/csv.rs
index 16b1317b2913..89e47a684698 100644
--- a/crates/polars-lazy/src/scan/csv.rs
+++ b/crates/polars-lazy/src/scan/csv.rs
@@ -195,7 +195,7 @@ impl<'a> LazyCsvReader<'a> {
         self
     }
 
-    /// Reduce memory usage in expensive of performance
+    /// Reduce memory usage at the expense of performance
     #[must_use]
     pub fn low_memory(mut self, toggle: bool) -> Self {
         self.low_memory = toggle;
diff --git a/crates/polars-lazy/src/scan/ndjson.rs b/crates/polars-lazy/src/scan/ndjson.rs
index ab9094295c23..f64cfc5e4efd 100644
--- a/crates/polars-lazy/src/scan/ndjson.rs
+++ b/crates/polars-lazy/src/scan/ndjson.rs
@@ -77,7 +77,7 @@ impl LazyJsonLineReader {
         self
     }
 
-    /// Reduce memory usage in expensive of performance
+    /// Reduce memory usage at the expense of performance
     #[must_use]
     pub fn low_memory(mut self, toggle: bool) -> Self {
         self.low_memory = toggle;