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diff --git a/src/tricks/raspberry_pi3_increase_swap_size.adoc b/src/tricks/raspberry_pi3_increase_swap_size.adoc
index aa542aa..dea4d01 100644
--- a/src/tricks/raspberry_pi3_increase_swap_size.adoc
+++ b/src/tricks/raspberry_pi3_increase_swap_size.adoc
@@ -5,20 +5,23 @@
 == Stop the swap
 
 ----
-dphys-swapfile swapoff
+sudo dphys-swapfile swapoff
 ----
 
 == Modify the size of the swap
 
 As `root`, edit the file `/etc/dphys-swapfile` and modify
-the variable `dphys-swapfile`:
+the variable `CONF_SWAPSIZE`:
 
 ----
 CONF_SWAPSIZE=1024
 ----
 
+To modify the swap file, edit the variable `CONF_SWAPFILE`, and run
+`dphys-swapfile setup` which will create and initialize the file.
+
 == Start the swap
 
 ----
-dphys-swapfile swapon
+sudo dphys-swapfile swapon
 ----
\ No newline at end of file