diff --git a/src/mlpack/core/optimizers/adam/adam.hpp b/src/mlpack/core/optimizers/adam/adam.hpp
index 37411d9bb0..d4808c6cd9 100644
--- a/src/mlpack/core/optimizers/adam/adam.hpp
+++ b/src/mlpack/core/optimizers/adam/adam.hpp
@@ -40,7 +40,8 @@ namespace optimization {
  *   author    = {Diederik P. Kingma and Jimmy Ba},
  *   title     = {Adam: {A} Method for Stochastic Optimization},
  *   journal   = {CoRR},
- *   year      = {2014}
+ *   year      = {2014},
+ *   url       = {http://arxiv.org/abs/1412.6980}
  * }
  * @endcode
  *
diff --git a/src/mlpack/core/optimizers/adam/adam_update.hpp b/src/mlpack/core/optimizers/adam/adam_update.hpp
index 95920c14ee..540ae1ce01 100644
--- a/src/mlpack/core/optimizers/adam/adam_update.hpp
+++ b/src/mlpack/core/optimizers/adam/adam_update.hpp
@@ -34,7 +34,8 @@ namespace optimization {
  *   author    = {Diederik P. Kingma and Jimmy Ba},
  *   title     = {Adam: {A} Method for Stochastic Optimization},
  *   journal   = {CoRR},
- *   year      = {2014}
+ *   year      = {2014},
+ *   url       = {http://arxiv.org/abs/1412.6980}
  * }
  * @endcode
  */
diff --git a/src/mlpack/core/optimizers/adam/adamax_update.hpp b/src/mlpack/core/optimizers/adam/adamax_update.hpp
index 97e26fe683..6337efaae3 100644
--- a/src/mlpack/core/optimizers/adam/adamax_update.hpp
+++ b/src/mlpack/core/optimizers/adam/adamax_update.hpp
@@ -36,7 +36,8 @@ namespace optimization {
  *   author    = {Diederik P. Kingma and Jimmy Ba},
  *   title     = {Adam: {A} Method for Stochastic Optimization},
  *   journal   = {CoRR},
- *   year      = {2014}
+ *   year      = {2014},
+ *   url       = {http://arxiv.org/abs/1412.6980}
  * }
  * @endcode
  */