diff --git a/ReleaseNotes.adoc b/ReleaseNotes.adoc
index 58473708a..175cb0479 100644
--- a/ReleaseNotes.adoc
+++ b/ReleaseNotes.adoc
@@ -14,7 +14,13 @@ For a complete list of changes, please look at ChangeLog.
 [[v4.3.1]]
 == Version 4.3.1 (under dev)
 
-No release notes.
+[[v4.3.1_libgcrypt]]
+=== Detection of libgcrypt
+
+The detection of libgcrypt has been fixed to properly detect libgcrypt >= 1.11. +
+As a consequence, the detection of an old version of libgcrypt is failing if the
+file `libgcrypt.pc` is not found. +
+This affects old distributions like Debian Buster and Ubuntu Bionic.
 
 [[v4.3.0]]
 == Version 4.3.0 (2024-05-26)