diff --git a/modules/fastp/main.nf b/modules/fastp/main.nf
index d8218350..5c9e3b83 100644
--- a/modules/fastp/main.nf
+++ b/modules/fastp/main.nf
@@ -13,7 +13,7 @@ process FASTP {
     val   save_merged
 
     output:
-    tuple val(meta), path('*.trim.fastq.gz')  , emit: reads
+    tuple val(meta), path('*.trim.fastq.gz')  , optional:true, emit: reads
     tuple val(meta), path('*.json')           , emit: json
     tuple val(meta), path('*.html')           , emit: html
     tuple val(meta), path('*.log')            , emit: log
diff --git a/modules/fastp/meta.yml b/modules/fastp/meta.yml
index f53bb09f..3274e41b 100644
--- a/modules/fastp/meta.yml
+++ b/modules/fastp/meta.yml
@@ -22,6 +22,12 @@ input:
       description: |
         List of input FastQ files of size 1 and 2 for single-end and paired-end data,
         respectively.
+  - save_trimmed_fail:
+      type: boolean
+      description: Specify true to save files that failed to pass trimming thresholds ending in `*.fail.fastq.gz`
+  - save_merged:
+      type: boolean
+      description: Specify true to save all merged reads to the a file ending in `*.merged.fastq.gz`
 
 output:
   - meta: