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diff --git a/openssl/doc/crypto/ERR_remove_state.pod b/openssl/doc/crypto/ERR_remove_state.pod
new file mode 100644
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+++ b/openssl/doc/crypto/ERR_remove_state.pod
@@ -0,0 +1,45 @@
+=pod
+
+=head1 NAME
+
+ERR_remove_thread_state, ERR_remove_state - free a thread's error queue
+
+=head1 SYNOPSIS
+
+ #include <openssl/err.h>
+
+ void ERR_remove_thread_state(const CRYPTO_THREADID *tid);
+
+Deprecated:
+
+ void ERR_remove_state(unsigned long pid);
+
+=head1 DESCRIPTION
+
+ERR_remove_thread_state() frees the error queue associated with thread B<tid>.
+If B<tid> == B<NULL>, the current thread will have its error queue removed.
+
+Since error queue data structures are allocated automatically for new
+threads, they must be freed when threads are terminated in order to
+avoid memory leaks.
+
+ERR_remove_state is deprecated and has been replaced by
+ERR_remove_thread_state. Since threads in OpenSSL are no longer identified
+by unsigned long values any argument to this function is ignored. Calling
+ERR_remove_state is equivalent to B<ERR_remove_thread_state(NULL)>.
+
+=head1 RETURN VALUE
+
+ERR_remove_thread_state and ERR_remove_state() return no value.
+
+=head1 SEE ALSO
+
+L<err(3)|err(3)>
+
+=head1 HISTORY
+
+ERR_remove_state() is available in all versions of SSLeay and OpenSSL. It
+was deprecated in OpenSSL 1.0.0 when ERR_remove_thread_state was introduced
+and thread IDs were introduced to identify threads instead of 'unsigned long'. 
+
+=cut