diff --git a/src/lib.rs b/src/lib.rs
index 37f8fca..af8914e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -70,6 +70,13 @@ fn genome_generate(params: &Parameters) -> anyhow::Result<()> {
             .collect::<Vec<_>>()
     );
 
+    if params.limit_genome_generate_ram != 31_000_000_000 {
+        log::warn!(
+            "--limitGenomeGenerateRAM {} accepted but not enforced; rustar manages genome-generation memory independently",
+            params.limit_genome_generate_ram
+        );
+    }
+
     info!("Building genome index...");
     let index = GenomeIndex::build(params)?;
 
diff --git a/src/params/mod.rs b/src/params/mod.rs
index 0204981..ce4dbee 100644
--- a/src/params/mod.rs
+++ b/src/params/mod.rs
@@ -294,6 +294,10 @@ pub struct Parameters {
     #[arg(long = "limitBAMsortRAM", default_value_t = 0)]
     pub limit_bam_sort_ram: u64,
 
+    /// Maximum RAM (bytes) for genome generation.
+    #[arg(long = "limitGenomeGenerateRAM", default_value_t = 31_000_000_000_u64)]
+    pub limit_genome_generate_ram: u64,
+
     /// Route primary alignment output to stdout instead of a file.
     /// Values: None (default), SAM, BAM_Unsorted, BAM_SortedByCoordinate.
     #[arg(long = "outStd", default_value = "None")]