diff --git a/Project.toml b/Project.toml
index 031d1d5..7d82dab 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "ModiaMath"
 uuid = "67ccffd1-116d-535b-ad39-76a8fd0cbf71"
 authors = ["Martin Otter <Martin.Otter@dlr.de>"]
-version = "0.5.0"
+version = "0.5.1"
 
 [deps]
 DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
diff --git a/README.md b/README.md
index 1778d13..d9f928c 100644
--- a/README.md
+++ b/README.md
@@ -108,13 +108,13 @@ instead the instructions
 
   # run all tests
   include("$(ModiaMath.path)/test/runtests.jl")
-    
+
 ```
 
 
 ## Status
 
-The ModiaMath version number is 0.5.0 and functionality and robustness is planned to be improved for the 1.0 version,
+The ModiaMath version number is 0.5.1 and functionality and robustness is planned to be improved for the 1.0 version,
 see [Plans for ModiaMath version 1.0](https://ModiaSim.github.io/ModiaMath.jl/latest/man/Plans.html).
 
 
diff --git a/docs/src/index.md b/docs/src/index.md
index 9003751..b3658f9 100644
--- a/docs/src/index.md
+++ b/docs/src/index.md
@@ -43,11 +43,20 @@ instead the instructions
 
 ## Release Notes
 
+### Version 0.5.1
+
+- New example ModiaMath/examples/Simulate_PendulumDAE (pendulum as index 3 system with
+  variables "x" and "y" (and not angle). Transformation to index 1 form with the
+  Gear-Gupta-Leimkuhler transformation.
+
+- Minor errors in Print/log output of lambda/mue variables corrected.
+
+
 ### Version 0.5.0
 
 - **Version is not backwards compatible**:
   * The values of `@enum structureOfDAE` have changed.
-  * `ModiaMath.SimulationState`: Keyword argument `structureOfDAE` has 
+  * `ModiaMath.SimulationState`: Keyword argument `structureOfDAE` has
     default `DAE_LinearDerivativesAndConstraints` instead of `DAE_NoSpecialStructure`.
     The consequence is that by default it is assumed that the DAE depends linearly
     on the derivatives (this should probably always be the case, so this should be uncritical).
@@ -76,7 +85,7 @@ instead the instructions
 
 - New example `examples/withoutMacros_withoutVariables/Simulate_IdealClutch.jl` to simulate
   an electrical circuit driving an inertia that is connected with an ideal clutch to a
-  second inertia. It is demonstrated how the index can change during simulation and 
+  second inertia. It is demonstrated how the index can change during simulation and
   how Dirac impulses are handled during initialization and at events.
 
 - Adapted tolerance of nonlinear solver so that it is identical to integrator tolerance
@@ -101,7 +110,7 @@ instead the instructions
 
 - ModiaMath.SimulationState has a new keyword argument `structureOfDAE`.
   It is now possible to define that the DAE is linear in all derivatives or all derivatives
-  are explicitely solved (= ODE). If one of the new structures is selected, 
+  are explicitely solved (= ODE). If one of the new structures is selected,
   initialization and re-initialization is more robust and more efficient
   (in particular no implicit Euler step is used).
 
diff --git a/src/ModiaMath.jl b/src/ModiaMath.jl
index 01345de..cb20760 100644
--- a/src/ModiaMath.jl
+++ b/src/ModiaMath.jl
@@ -66,8 +66,8 @@ Absolute path of package directory of ModiaMath
 """
 const path = dirname(dirname(@__FILE__))   # Absolute path of package directory
 const Time = Float64   # Prepare for later Integer type of time
-const Version = "0.5.0"
-const Date = "2019-04-04"
+const Version = "0.5.1"
+const Date = "2019-04-07"
 
 println(" \nImporting ModiaMath Version $Version ($Date)")