diff --git a/docs/Manual_Level.md b/docs/Manual_Level.md
index 1ade08e6..c9aafa93 100644
--- a/docs/Manual_Level.md
+++ b/docs/Manual_Level.md
@@ -179,13 +179,16 @@ Recv: // rear right screw : y=155.0, y=190.0, z=2.71500 : adjust CCW 00:50
 Recv: // read left screw : x=-5.0, y=190.0, z=2.47250 : adjust CW 00:02
 Recv: ok
 ```
-This means that:
 
+This means that:
 - front left screw is the reference point you must not change it.
 - front right screw must be turned clockwise 1 full turn and a quarter turn
 - rear right screw must be turned counter-clockwise 50 minutes
 - rear left screw must be turned clockwise 2 minutes (not need it's ok)
 
+Note that "minutes" refers to "minutes of a clock face". So, for
+example, 15 minutes is a quarter of a full turn.
+
 Repeat the process several times until you get a good level bed -
 normally when all adjustments are below 6 minutes.