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diff --git a/Documentation/snippets/tweaking-clef-properties.ly b/Documentation/snippets/tweaking-clef-properties.ly
index 0526c67876..a43faaca38 100644
--- a/Documentation/snippets/tweaking-clef-properties.ly
+++ b/Documentation/snippets/tweaking-clef-properties.ly
@@ -20,10 +20,12 @@ except @code{middleCPosition} are changed.
 Note that changing the glyph, the position of the clef, or the
 octavation does not in itself change the position of subsequent notes
 on the staff: the position of middle C must also be specified to do
-this. The positional parameters are relative to the staff center line,
-positive numbers displacing upwards, counting one for each line and
-space. The @code{clefTransposition} value would normally be set to 7, -7,
-15 or -15, but other values are valid.
+this. In order to get key signatures on the correct staff lines,
+@code{middleCClefPosition} must also be set.  The positional parameters
+are relative to the staff center line, positive numbers displacing
+upwards, counting one for each line and space. The
+@code{clefTransposition} value would normally be set to 7, -7, 15 or -15,
+but other values are valid.
 
 
 When a clef change takes place at a line break the new clef symbol is
@@ -43,36 +45,44 @@ line, they do not.
   doctitle = "Tweaking clef properties"
 } % begin verbatim
 
-
 \layout { ragged-right = ##t }
-
 {
   % The default treble clef
+  \key f \major
   c'1
   % The standard bass clef
   \set Staff.clefGlyph = #"clefs.F"
   \set Staff.clefPosition = #2
   \set Staff.middleCPosition = #6
+  \set Staff.middleCClefPosition = #6
+  \key g \major
   c'1
   % The baritone clef
   \set Staff.clefGlyph = #"clefs.C"
   \set Staff.clefPosition = #4
   \set Staff.middleCPosition = #4
+  \set Staff.middleCClefPosition = #4
+  \key f \major
   c'1
   % The standard choral tenor clef
   \set Staff.clefGlyph = #"clefs.G"
   \set Staff.clefPosition = #-2
   \set Staff.clefTransposition = #-7
   \set Staff.middleCPosition = #1
+  \set Staff.middleCClefPosition = #1
+  \key f \major
   c'1
   % A non-standard clef
   \set Staff.clefPosition = #0
   \set Staff.clefTransposition = #0
   \set Staff.middleCPosition = #-4
+  \set Staff.middleCClefPosition = #-4
+  \key g \major
   c'1 \break
 
   % The following clef changes do not preserve
-  % the normal relationship between notes and clefs:
+  % the normal relationship between notes, key signatures
+  % and clefs:
 
   \set Staff.clefGlyph = #"clefs.F"
   \set Staff.clefPosition = #2