diff --git a/ChangeLog.d/limit_size_of_diffie_hellman_calculations.txt b/ChangeLog.d/limit_size_of_diffie_hellman_calculations.txt
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+++ b/ChangeLog.d/limit_size_of_diffie_hellman_calculations.txt
@@ -0,0 +1,4 @@
+Security
+   * Limit the size of calculations performed by mbedtls_mpi_exp_mod to 
+     MBEDTLS_MPI_MAX_SIZE to prevent a potential denial of service when 
+     generating Diffie-Hellman key pairs. Credit to OSS-Fuzz.
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