Updated readme.

README.md

@@ -7,6 +7,7 @@ The UDP port `161` should be mapped to the desired SNMP port.
 By default this image contains an snmpwalk from `demo.snmplabs.com` under community name `demo`.
 
 ## Usage
+
 To use your own snmpwalks you should mount a folder with snmpwalks like this:
 
     docker run -v /somewhere/with/snmpwalks:/usr/local/snmpsim/data \
@@ -22,5 +23,8 @@ If you want to run snmpsimd with more flags then you can use `EXTRA_FLAGS`, like
                -e EXTRA_FLAGS="--v3-user=testing --v3-auth-key=testing123"
                ghcr.io/lextudio/docker-snmpsim:master
 
+To learn more about snmpsim, please visit [its docs](https://www.pysnmp.com/snmpsim/).
+
 ## Bug Reports
+
 Issues about this image should be reported to https://github.com/lextudio/pysnmp/issues.