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-rw-r--r--doc/UsersGuide/ThornWriters.tex2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/UsersGuide/ThornWriters.tex b/doc/UsersGuide/ThornWriters.tex
index f9291641..d833c189 100644
--- a/doc/UsersGuide/ThornWriters.tex
+++ b/doc/UsersGuide/ThornWriters.tex
@@ -4276,7 +4276,7 @@ CCTK_REAL Integrate(CCTK_REAL CCTK_FPOINTER func(CCTK_REAL IN x), \
\item A Fortran function is provided that inverts a real number. The {\tt
interface.ccl} should read
\begin{verbatim}
- SUBROUTINE Invert(CCTK_REAL OUT x)
+ SUBROUTINE Invert(CCTK_REAL INOUT x)
PROVIDES FUNCTION Invert WITH FindInverse LANGUAGE Fortran
USES FUNCTION Invert
\end{verbatim}