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diff --git a/src/armadillo/include/armadillo_bits/fn_trunc_log.hpp b/src/armadillo/include/armadillo_bits/fn_trunc_log.hpp
new file mode 100644
index 0000000..9cbf826
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/fn_trunc_log.hpp
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup fn_trunc_log
+//! @{
+
+
+
+template<typename eT>
+arma_warn_unused
+inline
+static
+typename arma_real_only<eT>::result
+trunc_log(const eT x)
+  {
+  if(std::numeric_limits<eT>::is_iec559)
+    {
+    if(x == std::numeric_limits<eT>::infinity())
+      {
+      return Datum<eT>::log_max;
+      }
+    else
+      {
+      return (x <= eT(0)) ? Datum<eT>::log_min : std::log(x);
+      }
+    }
+  else
+    {
+    return std::log(x);
+    }
+  }
+
+
+
+template<typename eT>
+arma_warn_unused
+inline
+static
+typename arma_integral_only<eT>::result
+trunc_log(const eT x)
+  {
+  return eT( trunc_log( double(x) ) );
+  }
+
+
+
+template<typename T>
+arma_warn_unused
+inline
+static
+std::complex<T>
+trunc_log(const std::complex<T>& x)
+  {
+  return std::complex<T>( trunc_log( std::abs(x) ), std::arg(x) );
+  }
+
+
+
+template<typename T1>
+arma_warn_unused
+arma_inline
+typename enable_if2< is_arma_type<T1>::value, const eOp<T1, eop_trunc_log> >::result
+trunc_log(const T1& A)
+  {
+  arma_extra_debug_sigprint();
+  
+  return eOp<T1, eop_trunc_log>(A);
+  }
+
+
+
+template<typename T1>
+arma_warn_unused
+arma_inline
+const eOpCube<T1, eop_trunc_log>
+trunc_log(const BaseCube<typename T1::elem_type,T1>& A)
+  {
+  arma_extra_debug_sigprint();
+  
+  return eOpCube<T1, eop_trunc_log>(A.get_ref());
+  }
+
+
+
+//! @}