2 files changed, 3 insertions, 1 deletions

diff --git a/.SRCINFO b/.SRCINFO
index a8545b0d86f2..48a47c25f057 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -10,6 +10,7 @@ pkgbase = m4b-tool-bin
 	depends = php
 	depends = php-intl
 	optdepends = fdkaac: for high efficiency codecs to perform conversions
+	optdepends = ffmpeg-libfdk_aac: to use fdkaac in conversions
 	options = !strip
 	source = m4b-tool.tar.gz::https://github.com/sandreas/m4b-tool/releases/download/v.0.4.2/m4b-tool.tar.gz
 	md5sums = 60746a96431c068f6880ebf510e2bac7
diff --git a/PKGBUILD b/PKGBUILD
index f4bf4c278f51..d827ba76cd16 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -12,7 +12,8 @@ depends=('ffmpeg'
     'libmp4v2'
     'php'
     'php-intl')
-optdepends=('fdkaac: for high efficiency codecs to perform conversions')
+optdepends=('fdkaac: for high efficiency codecs to perform conversions'
+    'ffmpeg-libfdk_aac: to use fdkaac in conversions')
 options=('!strip')
 source=("m4b-tool.tar.gz::https://github.com/sandreas/m4b-tool/releases/download/v.${pkgver}/m4b-tool.tar.gz")