diff --git a/source/Concepts/Basic/About-Actions.rst b/source/Concepts/Basic/About-Actions.rst
index fe0311b119..2109348d71 100644
--- a/source/Concepts/Basic/About-Actions.rst
+++ b/source/Concepts/Basic/About-Actions.rst
@@ -38,7 +38,7 @@ For instance, consider an action to calculate the Fibonacci sequence with the fo
    ---
    int32[] sequence
    ---
-   int32[] sequence
+   int32[] partial_sequence
 
 The action server is the entity that receives this message, starts calculating the sequence up to ``order`` (providing feedback along the way), and finally returns a full result in ``sequence``.
 
diff --git a/source/Concepts/Basic/About-Interfaces.rst b/source/Concepts/Basic/About-Interfaces.rst
index ed72f28c0c..87c9b46560 100644
--- a/source/Concepts/Basic/About-Interfaces.rst
+++ b/source/Concepts/Basic/About-Interfaces.rst
@@ -301,7 +301,7 @@ For instance, the ``Fibonacci`` action definition contains the following:
    ---
    int32[] sequence
    ---
-   int32[] sequence
+   int32[] partial_sequence
 
 This is an action definition where the action client is sending a single ``int32`` field representing the number of Fibonacci steps to take, and expecting the action server to produce an array of ``int32`` containing the complete steps.
 Along the way, the action server may also provide an intermediate array of ``int32`` containing the steps accomplished up until a certain point.