diff --git a/plug-in-development/index.html b/plug-in-development/index.html
index 3cadcc1..9c25295 100644
--- a/plug-in-development/index.html
+++ b/plug-in-development/index.html
@@ -169,6 +169,10 @@ Some plug-ings produce projects (Java, Kotlin) while others don't (Packaging, Ap
     artifacts can be found.
 </p>
 
+<h4>Compiler flag contributors (<a href="https://github.com/cbeust/kobalt/blob/master/src/main/kotlin/com/beust/kobalt/api/ICompilerFlagContributor.kt"><code>ICompilerFlagContributor</code>)</a></h4>
+<p>
+    Plug-ins can add flags to the compiler by implementing this interface.
+</p>
 
 <h2 class="section" id="directives">Directives</h2>
 <p>