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diff --git a/docs/source/markdown/podman-system-prune.1.md b/docs/source/markdown/podman-system-prune.1.md
index 431a11267..791503a2c 100644
--- a/docs/source/markdown/podman-system-prune.1.md
+++ b/docs/source/markdown/podman-system-prune.1.md
@@ -18,6 +18,21 @@ By default, volumes are not removed to prevent important data from being deleted
Recursively remove all unused pod, container, image and volume data (Maximum 50 iterations.)
+#### **--filter**=*filters*
+
+Provide filter values.
+
+The --filter flag format is of “key=value”. If there is more than one filter, then pass multiple flags (e.g., --filter "foo=bar" --filter "bif=baz")
+
+Supported filters:
+
+- `until` (_timestamp_) - only remove containers and images created before given timestamp
+- `label` (label=_key_, label=_key=value_, label!=_key_, or label!=_key=value_) - only remove containers and images, with (or without, in case label!=... is used) the specified labels.
+
+The until filter can be Unix timestamps, date formatted timestamps, or Go duration strings (e.g. 10m, 1h30m) computed relative to the machine’s time.
+
+The label filter accepts two formats. One is the label=... (label=_key_ or label=_key=value_), which removes containers and images with the specified labels. The other format is the label!=... (label!=_key_ or label!=_key=value_), which removes containers and images without the specified labels.
+
#### **--force**, **-f**
Do not prompt for confirmation
@@ -35,3 +50,4 @@ podman(1), podman-image-prune(1), podman-container-prune(1), podman-pod-prune(1)
## HISTORY
February 2019, Originally compiled by Dan Walsh (dwalsh at redhat dot com)
+December 2020, converted filter information from docs.docker.com documentation by Dan Walsh (dwalsh at redhat dot com)