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-rw-r--r--doc/man/libkeccak_update.32
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/man/libkeccak_update.3 b/doc/man/libkeccak_update.3
index c291ed9..d83f74b 100644
--- a/doc/man/libkeccak_update.3
+++ b/doc/man/libkeccak_update.3
@@ -44,7 +44,7 @@ function may fail for any reason specified by the function
.BR malloc (3).
.SH NOTES
Neither parameter by be
-.O NULL
+.I NULL
or 0.
.SH EXAMPLE
This example calculates the Keccak[b = 1024, c = 576, n = 256]