diff --git a/src/doc/user/recoll.conf.xml b/src/doc/user/recoll.conf.xml
index 31c4b1d9..2c5b219f 100644
--- a/src/doc/user/recoll.conf.xml
+++ b/src/doc/user/recoll.conf.xml
@@ -177,6 +177,13 @@ processing of any compressed file. Default 100 MB.
 <listitem><para>Size limit for text files. Mostly for skipping monster logs. Default 20 MB. Use a value of -1 to
 disable.
 </para></listitem></varlistentry>
+<varlistentry id="RCL.INSTALL.CONFIG.RECOLLCONF.TEXTUNKNOWNASPLAIN">
+<term><varname>textunknownasplain</varname></term>
+<listitem><para>Process unknown text/xxx files as text/plain Allows indexing misc. text files identified as text/whatever by 'file' or 'xdg-mime'
+without having to explicitely set config entries for them. This works fine for indexing (but will
+cause processing of a lot of garbage though), but the documents indexed this way will be opened by
+the desktop viewer, even if text/plain has a specific editor.
+</para></listitem></varlistentry>
 <varlistentry id="RCL.INSTALL.CONFIG.RECOLLCONF.INDEXALLFILENAMES">
 <term><varname>indexallfilenames</varname></term>
 <listitem><para>Index the file names of
diff --git a/src/doc/user/usermanual.html b/src/doc/user/usermanual.html
index dda8d305..856e012c 100644
--- a/src/doc/user/usermanual.html
+++ b/src/doc/user/usermanual.html
@@ -9291,6 +9291,21 @@ hasextract = False
                   disable.</p>
                 </dd>
                 <dt><a name=
+                "RCL.INSTALL.CONFIG.RECOLLCONF.TEXTUNKNOWNASPLAIN"
+                id=
+                "RCL.INSTALL.CONFIG.RECOLLCONF.TEXTUNKNOWNASPLAIN"></a><span class="term"><code class="varname">textunknownasplain</code></span></dt>
+                <dd>
+                  <p>Process unknown text/xxx files as text/plain
+                  Allows indexing misc. text files identified as
+                  text/whatever by 'file' or 'xdg-mime' without
+                  having to explicitely set config entries for
+                  them. This works fine for indexing (but will
+                  cause processing of a lot of garbage though), but
+                  the documents indexed this way will be opened by
+                  the desktop viewer, even if text/plain has a
+                  specific editor.</p>
+                </dd>
+                <dt><a name=
                 "RCL.INSTALL.CONFIG.RECOLLCONF.INDEXALLFILENAMES"
                 id=
                 "RCL.INSTALL.CONFIG.RECOLLCONF.INDEXALLFILENAMES"></a><span class="term"><code class="varname">indexallfilenames</code></span></dt>