Jeg vil gerne nævne en lille fejl i dokumentet, før du sender det.

In this sentence, jeg vil gerne is the natural polite way to say I would like to.

• vil literally means want to / will
• gerne often adds the sense of gladly / willingly / would like to

So:

• Jeg vil nævne ... = I want to mention ... or I will mention ...
• Jeg vil gerne nævne ... = I would like to mention ...

Adding gerne makes the sentence softer and more polite, which is very common in Danish.

After a modal verb like vil, Danish uses the infinitive of the main verb, without at.

So:

• vil nævne = want to mention
• not vil nævner
• not vil at nævne

This is similar to English:

• I want to mention
• not I want mentions

Common Danish modal verbs that work this way include:

• vil = want to / will
• kan = can
• skal = must / will
• må = may / must
• bør = should

Nævne means to mention.

In this sentence, it suggests briefly bringing something up, not necessarily discussing it in great detail.

So Jeg vil gerne nævne en lille fejl ... feels like:

• I’d like to mention a small mistake ...
• I’d like to point out a small error ...

Depending on context, English might translate it a bit differently, but mention is the direct basic meaning.

Because fejl is a common gender noun in Danish, so it takes en in the singular indefinite form.

• en fejl = a mistake / an error

Danish nouns are either:

• common gender → usually take en
• neuter gender → usually take et

So:

• en fejl
• not et fejl

The adjective lille is a bit special. It often stays lille in the singular, especially before a noun.

So:

• en lille fejl = a small mistake
• et lille problem = a small problem

Unlike many other adjectives, where you would often see different forms, lille is very commonly used as lille before singular nouns.

You may also see små in the plural:

• små fejl = small mistakes

Dokumentet is the definite singular form of dokument.

• et dokument = a document
• dokumentet = the document

The ending -et is the normal definite ending for many neuter nouns.

So:

• i dokumentet = in the document

This is a key feature of Danish: instead of putting a separate word for the before the noun, Danish often adds the definite ending to the noun itself.

Because once dokumentet has been introduced, Danish can refer back to it with the pronoun det = it.

So:

• i dokumentet = in the document
• før du sender det = before you send it

Here, det refers back to dokumentet.

This works just like English:

• I saw the document before you sent it

Because før introduces a subordinate clause.

In Danish subordinate clauses, the word order is usually more like English:

• du sender det = you send it

So:

• før du sender det = before you send it

If you said før sender du det, that would sound wrong here, because it uses main-clause word order after før.

A useful rule:

• main clause: verb often comes early in second position
• subordinate clause: subject usually comes before the verb

Danish often uses the present tense for future meaning, especially when the timing is already clear from context.

Here, før already shows that the sending will happen later relative to the mentioning.

So:

• før du sender det literally looks like before you send it
• but it naturally refers to a future action

English does something very similar:

• Before you send it, ... not
• Before you will send it, ...

So this is very normal in both languages.

Here fejl is being used as a singular countable noun:

• en fejl = a mistake / an error

So en lille fejl means a small mistake.

You would not say en fejlene. That form is not correct Danish.

Some useful forms are:

• en fejl = a mistake
• fejlen = the mistake
• fejl = mistakes or sometimes error in a more general sense, depending on context
• fejlene = the mistakes

In this sentence, the speaker means one specific small error, so en lille fejl is the right form.

Yes, it sounds polite and natural.

Jeg vil gerne nævne ... is a gentle way to raise a problem, and en lille fejl also softens the message. Together they make the sentence sound tactful rather than harsh.

It has the tone of:

• I’d just like to mention a small error in the document before you send it.

So for professional or everyday communication, this is a very natural way to say it.