IDE.md: Add Eclipse update site for AJDT compatible with 2021-09

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

diff --git a/docs/developer/IDE.md b/docs/developer/IDE.md
index 3dfb38eef3113ab9c19207b12b84bb9e74a6a6e6..14621ecee442b1f9032ca6f251ee91ade0544b0b 100644 (file)
--- a/docs/developer/IDE.md
+++ b/docs/developer/IDE.md
@@ -32,6 +32,7 @@ projects using AspectJ Maven Plugin.
 #### AspectJ Development Tools (AJDT)
 
 Use an update sites corresponding to your Eclipse version (minimal version listed):
+* Eclipse 2021-09 (4.21): https://aspectj.dev/eclipse/ajdt/421
 * Eclipse 2021-03 (4.19): https://aspectj.dev/eclipse/ajdt/419
 * Eclipse 2018-12 (4.10): https://download.eclipse.org/tools/ajdt/410/dev/update
 * For older versions, please refer to https://www.eclipse.org/ajdt/downloads (page was not updated in a long time,