diff --git a/docs/services/chemspectra/sec.mdx b/docs/services/chemspectra/sec.mdx
index 48728355..602b9a11 100644
--- a/docs/services/chemspectra/sec.mdx
+++ b/docs/services/chemspectra/sec.mdx
@@ -16,3 +16,6 @@ For SEC analysis, we currently support [JCAMP-DX files](https://iupac.org/what-w
 
 4. Peaks list of the selected spectra:
    ![chemspectra selected sec curve](/img/chemspectra/sec/chemspectra_sec_3.png)
+
+5. Select the detector used:
+   ![chemspectra select detector](/img/chemspectra/sec/chemspectra_sec_4.png)
diff --git a/static/img/chemspectra/sec/chemspectra_sec_1.png b/static/img/chemspectra/sec/chemspectra_sec_1.png
index f73d12f5..bde1ba64 100644
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diff --git a/static/img/chemspectra/sec/chemspectra_sec_2.png b/static/img/chemspectra/sec/chemspectra_sec_2.png
index fa02622d..63071bba 100644
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diff --git a/static/img/chemspectra/sec/chemspectra_sec_3.png b/static/img/chemspectra/sec/chemspectra_sec_3.png
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diff --git a/static/img/chemspectra/sec/chemspectra_sec_4.png b/static/img/chemspectra/sec/chemspectra_sec_4.png
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