diff --git a/extra/thunderbird/PKGBUILD b/extra/thunderbird/PKGBUILD
index c92afc6e9..d123d7766 100644
--- a/extra/thunderbird/PKGBUILD
+++ b/extra/thunderbird/PKGBUILD
@@ -8,6 +8,7 @@
 #  - mozconfig changes for ARM
 #  - patch to remove NEON/SIMD checks from configure
 #  - memory saving LDFLAGS
+#  - enable calendar in mozconfig
 
 buildarch=20