Missing output in tutorial tools/alignment.py?

[kinow]

The tools/alighment.py file is first created in the tutorial 1.

# File: tools/alignment.py

from janis_core import WorkflowBuilder, String

from janis_bioinformatics.data_types import FastqGzPairedEnd, FastaWithDict

from janis_bioinformatics.tools.bwa import BwaMemLatest
from janis_bioinformatics.tools.samtools import SamToolsView_1_9
from janis_bioinformatics.tools.gatk4 import Gatk4SortSam_4_1_2

w = WorkflowBuilder("alignmentWorkflow")

# Inputs
w.input("sample_name", String)
w.input("read_group", String)
w.input("fastq", FastqGzPairedEnd)
w.input("reference", FastaWithDict)

# Steps
w.step(
    "bwamem", 
    BwaMemLatest( 
        reads=w.fastq, 
        readGroupHeaderLine=w.read_group, 
        reference=w.reference
    )
)
w.step(
    "samtoolsview", 
    SamToolsView_1_9(
        sam=w.bwamem.out
    )
)

w.step(
    "sortsam",
    Gatk4SortSam_4_1_2(
        bam=w.samtoolsview.out,
        sortOrder="coordinate",
        createIndex=True
    )
)

# Outputs
w.output("out", source=w.sortsam.out)

In tutorial 3, there's a paragraph that says

I think tools/alignment.py has only out output, while tools/samtoolsflagstat.py has the stats output?

# File: tools/samtoolsflagstat.py

from janis_core import CommandToolBuilder, ToolInput, ToolOutput, Int, Stdout

from janis_unix.data_types import TextFile
from janis_bioinformatics.data_types import Bam

SamtoolsFlagstat = CommandToolBuilder(
    tool="samtoolsflagstat",
    base_command=["samtools", "flagstat"],
    container="quay.io/biocontainers/samtools:1.9--h8571acd_11",
    version="v1.9.0",
    inputs=[
        # 1. Positional bam input
        ToolInput("bam", Bam, position=1),
        # 2. `threads` inputs
        ToolInput("threads", Int(optional=True), prefix="--threads"),
    ],
    outputs=[ToolOutput("stats", Stdout(TextFile))],
)

Not really a user of these tools, and just getting started with Janis, so maybe I missed something? Or is there an error in that paragraph? Found while reading tutorials and preparing #51

Thanks!
Bruno