--- a/doc/sheets.texi
+++ b/doc/sheets.texi
@@ -402,7 +402,7 @@ This style highlights MASM ASM code.
 @end deftp
 
 @deftp {Style Sheet} {Matlab} (@file{matlab.ssh})
-Written by Joakim Lübeck.
+Written by Joakim L@"{u}beck.
 This style highlights function definitions and a limited
 number of keywords, mostly control constructs, and is
 therefore usable for many Matlab versions. Special care