add a disclaimer for users of v0.3 that #define CROW_MAIN is required.

Signed-off-by: Luca Schlecker <luca.schlecker@hotmail.com>
CrowCpp · Nov 21, 2021 · 18ba83a · 18ba83a
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diff --git a/README.md b/README.md
@@ -34,6 +34,10 @@ Available [here](https://crowcpp.org).
 
 ## Examples
 
+#### Disclaimer
+
+> If you are using version v0.3, then you have to put `#!cpp #define CROW_MAIN` at the top of one and only one source file.
+
 #### Hello World
 ```cpp
 #include "crow.h"

diff --git a/docs/getting_started/your_first_application.md b/docs/getting_started/your_first_application.md
@@ -3,6 +3,10 @@ This page shows how you can get started with a simple hello world application.
 ## 1. Include
 Starting with an empty `main.cpp` file, first add `#!cpp #include "crow.h"` or `#!cpp #include "crow_all.h"` if you're using the single header file.
 
+!!! note
+
+    If you are using version v0.3, then you have to put `#!cpp #define CROW_MAIN` at the top of one and only one source file.
+
 ## 2. App declaration
 Next Create a `main()` and declare a `#!cpp crow::SimpleApp` inside, your code should look like this
 ``` cpp