Update and clean up Changelog for #622
diff --git a/ChangeLog b/ChangeLog
index 5306d52..4d1ff8f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -38,13 +38,9 @@
    * Fixed the sample applications gen_key.c, cert_req.c and cert_write.c for
      builds where the configuration MBEDTLS_PEM_WRITE_C is not defined. Found
      by inestlerode. #559.
-   * Fixed pthread implementation to avoid unintended double initialisations
-     and double frees. (found by Niklas Amnebratt)
-   * Fixed default threading implementation to avoid accidental double
-     initialisations and double frees.
    * Fix mbedtls_x509_get_sig() to update the ASN1 type in the mbedtls_x509_buf
      data structure until after error checks are successful. Found by
-     subramanyam-c.
+     subramanyam-c. #622
    * Fix documentation and implementation missmatch for function arguments of
      mbedtls_gcm_finish(). Found by cmiatpaar. #602
    * Guarantee that P>Q at RSA key generation. Found by inestlerode. #558