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-rw-r--r--lib/libcrypt/crypt.31
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diff --git a/lib/libcrypt/crypt.3 b/lib/libcrypt/crypt.3
index 41c36c3..8fc6da2 100644
--- a/lib/libcrypt/crypt.3
+++ b/lib/libcrypt/crypt.3
@@ -38,6 +38,7 @@
.Nm crypt
.Nd Trapdoor encryption
.Sh SYNOPSIS
+.Fd #include <unistd.h>
.Ft char *
.Fn crypt "const char *key" "const char *salt"
.Sh DESCRIPTION
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