diff --git a/build/docker/README.md b/build/docker/README.md
index 5ab48b47b..6111b8305 100644
--- a/build/docker/README.md
+++ b/build/docker/README.md
@@ -9,7 +9,7 @@ They can be found on Docker Hub:
 
 ## Dockerfiles
 
-The `Dockerfile` is a multistage file which can build all three Dendrite
+The `Dockerfile` is a multistage file which can build all four Dendrite
 images depending on the supplied `--target`. From the root of the Dendrite
 repository, run: