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-rw-r--r--doc/man3/BN_CTX_start.pod1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/man3/BN_CTX_start.pod b/doc/man3/BN_CTX_start.pod
index bf3a8b59ad..d4780fe9cd 100644
--- a/doc/man3/BN_CTX_start.pod
+++ b/doc/man3/BN_CTX_start.pod
@@ -27,6 +27,7 @@ calls must be made before calling any other functions that use the
B<ctx> as an argument.
Finally, BN_CTX_end() must be called before returning from the function.
+If B<ctx> is NULL, nothing is done.
When BN_CTX_end() is called, the B<BIGNUM> pointers obtained from
BN_CTX_get() become invalid.