Nevermind, I can't push, so here's the diff:

diff --git a/_includes/manuals/1.12/3.5.2_configuration_options.md 
b/_includes/manuals/1.12/3.5.2_conf
index 6eafb9b..b1b26dd 100644
--- a/_includes/manuals/1.12/3.5.2_configuration_options.md
+++ b/_includes/manuals/1.12/3.5.2_configuration_options.md
@@ -385,7 +385,13 @@ See also: dns_conflict_timeout

 ##### remote_addr

-If Foreman is running behind Passenger or a remote load balancer, the IP 
of this load balance should
+When foreman receives client web requests via a smart proxy, proxy or load 
balancer, the original client source IP address is lost, replaced by the 
smart proxy, proxy, or load balancers IP instead.  For template requests 
without a token, this causes a failure, because foreman can't match the 
request against a valid host.
+
+Smart proxies, and other devices if configured, can preserve the original 
client IP within an HTTP X-Forwarded-For header, which foreman can evaluate 
and use to match the request against a valid host.
+
+In order to prevent spoofing and provide some level of security, foreman 
will only evaluate X-Forwarded-For headers from devices which match the 
list of IPs configured here.
+
+This is a regular expression, so it can support several load balancers, 
i.e: (10.0.0.1|127.0.0.1)
 Default: 127.0.0.1

 ##### require_ssl_smart_proxies

On Sunday, July 17, 2016 at 1:29:16 PM UTC-4, adrian wrote:
>
> I cloned the repo, modified the doc section, and committed.
>
> First time doing this on github, so if I've done something backwards, or 
> broken any code etiquette, I stand to be corrected. ;)
>
> On Sunday, July 17, 2016 at 11:38:23 AM UTC-4, Greg Sutcliffe wrote:
>>
>> On 17 July 2016 at 16:22, adiran <[email protected]> wrote:
>>
>>> Ok, this makes a little more sense.  So in an environment with many 
>>> smart-proxies, the IP of each one would need to be included in this regexp?
>>>
>>> I just assumed that foreman would take care of accepting X-Forwarded-For 
>>> from smart-proxy IPs which are registered, since it already knows about 
>>> them.
>>>
>>
>> I'm away from my desk, so I'm working from memory, but I think this 
>> predates the smart-proxy-auth system that came in later for validating 
>> things like ENC requests from valid proxies. The main issue there is that 
>> the proxy-auth relies on validating the names in the SSL certificate -  
>> templates usually aren't acquired over https, so this wouldn't work here. 
>> It might be possible to adapt / re-use some of those ideas though - I do 
>> agree that it's non-intuitive compared to how ENC/reports works.
>>  
>>
>>> This setting could use a little more detail in the manual, glad you 
>>> recall.
>>>
>>
>> Sure, feel free - 
>> https://github.com/theforeman/theforeman.org/blob/gh-pages/_includes/manuals/1.12/3.5.2_configuration_options.md
>>  
>> :)
>>
>> Greg
>>
>

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