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-rw-r--r--doc/man1/openssl-ecparam.pod.in8
-rw-r--r--doc/man1/openssl-pkeyparam.pod.in5
2 files changed, 9 insertions, 4 deletions
diff --git a/doc/man1/openssl-ecparam.pod.in b/doc/man1/openssl-ecparam.pod.in
index 4585050514..27ce10490f 100644
--- a/doc/man1/openssl-ecparam.pod.in
+++ b/doc/man1/openssl-ecparam.pod.in
@@ -55,14 +55,16 @@ Parameters are encoded as B<EcpkParameters> as specified in IETF RFC 3279.
=item B<-in> I<filename>
-This specifies the input filename to read parameters from or standard input if
+This specifies the input file to read parameters from or standard input if
this option is not specified.
=item B<-out> I<filename>
This specifies the output filename parameters to. Standard output is used
-if this option is not present. The output filename should B<not> be the same
-as the input filename.
+if this option is not present.
+The output filename can be the same as the input filename,
+which leads to replacing the file contents.
+Note that file I/O is not atomic. The output file is truncated and then written.
=item B<-noout>
diff --git a/doc/man1/openssl-pkeyparam.pod.in b/doc/man1/openssl-pkeyparam.pod.in
index 5053316c68..b8b1792f28 100644
--- a/doc/man1/openssl-pkeyparam.pod.in
+++ b/doc/man1/openssl-pkeyparam.pod.in
@@ -35,13 +35,16 @@ Print out a usage message.
=item B<-in> I<filename>
-This specifies the input filename to read parameters from or standard input if
+This specifies the input file to read parameters from or standard input if
this option is not specified.
=item B<-out> I<filename>
This specifies the output filename to write parameters to or standard output if
this option is not specified.
+The output filename can be the same as the input filename,
+which leads to replacing the file contents.
+Note that file I/O is not atomic. The output file is truncated and then written.
=item B<-text>