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-rw-r--r--synapse/python_dependencies.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index 8de8cb2c12..39c99a2802 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -98,6 +98,9 @@ CONDITIONAL_REQUIREMENTS = {
     "sentry": ["sentry-sdk>=0.7.2"],
     "opentracing": ["jaeger-client>=4.0.0", "opentracing>=2.2.0"],
     "jwt": ["pyjwt>=1.6.4"],
+    # hiredis is not a *strict* dependency, but it makes things much faster.
+    # (if it is not installed, we fall back to slow code.)
+    "redis": ["txredisapi>=1.4.7", "hiredis"],
 }
 
 ALL_OPTIONAL_REQUIREMENTS = set()  # type: Set[str]