diff --git a/docs/learn-the-basics/main_concepts.md b/docs/learn-the-basics/main_concepts.md
index dcdf14b..b453ae7 100644
--- a/docs/learn-the-basics/main_concepts.md
+++ b/docs/learn-the-basics/main_concepts.md
@@ -88,7 +88,7 @@ For the time being, it is important to know that:
 - The number, name and kind of ports of a Node must be known at _compilation-time_ (C++); 
   connections between ports are done at _deployment-time_ (XML).  
 
-- You can store as value any C++ type (we use a __type erasure_ technique
+- You can store as value any C++ type (we use a _type erasure_ technique
 similar to [std::any](https://www.fluentcpp.com/2021/02/05/how-stdany-works/)).
 
 
diff --git a/versioned_docs/version-3.8/learn-the-basics/main_concepts.md b/versioned_docs/version-3.8/learn-the-basics/main_concepts.md
index a2dc2b9..60ce42f 100644
--- a/versioned_docs/version-3.8/learn-the-basics/main_concepts.md
+++ b/versioned_docs/version-3.8/learn-the-basics/main_concepts.md
@@ -88,7 +88,7 @@ For the time being, it is important to know that:
 - The number, name and kind of ports of a Node must be known at _compilation-time_ (C++); 
   connections between ports are done at _deployment-time_ (XML).  
 
-- You can store as value any C++ type (we use a __type erasure_ technique
+- You can store as value any C++ type (we use a _type erasure_ technique
 similar to [std::any](https://www.fluentcpp.com/2021/02/05/how-stdany-works/)).
 
 
diff --git a/versioned_docs/version-4.0.2/learn-the-basics/main_concepts.md b/versioned_docs/version-4.0.2/learn-the-basics/main_concepts.md
index dcdf14b..b453ae7 100644
--- a/versioned_docs/version-4.0.2/learn-the-basics/main_concepts.md
+++ b/versioned_docs/version-4.0.2/learn-the-basics/main_concepts.md
@@ -88,7 +88,7 @@ For the time being, it is important to know that:
 - The number, name and kind of ports of a Node must be known at _compilation-time_ (C++); 
   connections between ports are done at _deployment-time_ (XML).  
 
-- You can store as value any C++ type (we use a __type erasure_ technique
+- You can store as value any C++ type (we use a _type erasure_ technique
 similar to [std::any](https://www.fluentcpp.com/2021/02/05/how-stdany-works/)).