diff --git a/README.md b/README.md
index c160a21adb921da79ae660196d5fa33e20af74fc..97c629abbcb87f385c0c420401d4058e58a53174 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,7 @@ Parameters:
     -M, --multipole-reconstruction    Reconstruct the multipoles every time-step.
     -s, --hydro                       Run with hydrodynamics.
     -S, --stars                       Run with stars.
+    -B, --black-holes                 Run with black holes.
     -x, --velociraptor                Run with structure finding.
     --limiter                         Run with time-step limiter.
 
diff --git a/doc/RTD/source/CommandLineOptions/index.rst b/doc/RTD/source/CommandLineOptions/index.rst
index 88493ddb10ff2a4978e5e4b31a55efc87ba45d3b..94fc72ae38074c165ca1e28ff175961b9a9b9a87 100644
--- a/doc/RTD/source/CommandLineOptions/index.rst
+++ b/doc/RTD/source/CommandLineOptions/index.rst
@@ -30,6 +30,7 @@ can be found by typing ``./swift -h``::
     -M, --multipole-reconstruction    Reconstruct the multipoles every time-step.
     -s, --hydro                       Run with hydrodynamics.
     -S, --stars                       Run with stars.
+    -B, --black-holes                 Run with black holes.
     -x, --velociraptor                Run with structure finding.
     --limiter                         Run with time-step limiter.