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-rw-r--r--Doc/lib/libfpformat.tex7
1 files changed, 5 insertions, 2 deletions
diff --git a/Doc/lib/libfpformat.tex b/Doc/lib/libfpformat.tex
index 94e434c..c67d834 100644
--- a/Doc/lib/libfpformat.tex
+++ b/Doc/lib/libfpformat.tex
@@ -38,8 +38,11 @@ Return value is a string.
\end{funcdesc}
\begin{excdesc}{NotANumber}
-Exception raised when a string does not look like a number when the
-documentation says it should.
+Exception raised when a string passed to \function{fix()} or
+\function{sci()} as the \var{x} parameter does not look like a number.
+This is a subclass of \exception{ValueError} when the standard
+exceptions are strings. The exception value is the improperly
+formatted string that caused the exception to be raised.
\end{excdesc}
Example: