diff --git a/docs/en/assemble_4_2.md b/docs/en/assemble_4_2.md
index 433a4033..7e5c8e83 100644
--- a/docs/en/assemble_4_2.md
+++ b/docs/en/assemble_4_2.md
@@ -226,11 +226,11 @@ Install the damper struts, fix COEX Pix on them with nylon nuts.
6. Connect the LED strip power (red, black cables) to the short JST connector on the PDB.
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+
7. Connect the signal output of the LED strip (white cable) to Raspberry Ri, to pin *GPIO21*.
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+
## Installing guard