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-rw-r--r--doc/documentation.tex2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/documentation.tex b/doc/documentation.tex
index 7318978..620fba2 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -163,7 +163,7 @@ using three include files:
\end{description}
The macros which compute derivatives also use the following variables;
-you should avoid using these in your code:
+you should avoid using these in your code, in either lower or upper case:
\begin{verbatim}
di2, dj2, dk2 /* only in C, not in Fortran */
dt, dx, dy, dz