diff --git a/doc/manuals/chapters/cells.adoc b/doc/manuals/chapters/cells.adoc
new file mode 100644
index 0000000..a54c026
--- /dev/null
+++ b/doc/manuals/chapters/cells.adoc
@@ -0,0 +1,26 @@
+== Configure Cell Locations
+
+To determine geographic location estimates based on the serving cell, OsmoSMLC
+needs preconfigured global positions by latitude and longitude, for each cell of
+each BSC.
+
+On the `cells` configuration node, cell locations can be indicated by LAC and
+CI, or by Cell Global Identity. The following example configures the position
+for a cell by LAC 23 and CI 42:
+
+----
+cells
+ lac-ci 23 42 lat 12.3456 lon 23.4567
+----
+
+The following example configures the position by a Cell Global Identity with
+PLMN 001-01, LAC 2 and CI 3:
+
+----
+cells
+ cgi 001 01 2 3 lat 34.5678 lon 45.6789
+----
+
+If a cell's latitude and longitude is not configured, all location requests for
+subscribers served by that cell are answered by a BSSMAP-LE Perform Location
+Response without a Location Estimate and  LCS Cause "Facility not supported".
diff --git a/doc/manuals/chapters/positioning.adoc b/doc/manuals/chapters/positioning.adoc
new file mode 100644
index 0000000..e16c224
--- /dev/null
+++ b/doc/manuals/chapters/positioning.adoc
@@ -0,0 +1,11 @@
+== Positioning Methods
+
+So far, OsmoSMLC provides only TA-based positioning.
+
+=== TA-Based Positioning
+
+In TA-based positioning, the serving Cell Id and the Timing Advance (a.k.a.
+Access Delay) are provided by the BSC. OsmoSMLC returns a GAD "ellipsoid point
+with uncertainty circle" as location estimate. The ellipsoid point is the
+latitude and longitude of the serving cell, and the uncertainty circle is the
+maximum distance from that cell based on the Timing Advance information.
diff --git a/doc/manuals/chapters/running.adoc b/doc/manuals/chapters/running.adoc
index 0a3174e..684866e 100644
--- a/doc/manuals/chapters/running.adoc
+++ b/doc/manuals/chapters/running.adoc
@@ -63,10 +63,11 @@
 ===== Configure SCCP/M3UA (AoIP)
 
 OsmoSMLC acts as client to contact an STP instance and establish an SCCP/M3UA
-link.
+link. OsmoSMLC always uses the SSN "SMLC (BSSMAP-LE)" (SSN code 252). The
+configurable point-code defaults to 0.23.6 (190).
 
 An example configuration of OsmoSMLC's Lb SCCP link, assuming the SMLC at
-point-code 1.23.6 via an SG listening for M3UA at 127.0.0.1:2905:
+point-code 1.23.6, listening for M3UA at 127.0.0.1:2905:
 
 ----
 cs7 instance 0
diff --git a/doc/manuals/osmosmlc-usermanual.adoc b/doc/manuals/osmosmlc-usermanual.adoc
index 0be3a23..d2aa544 100644
--- a/doc/manuals/osmosmlc-usermanual.adoc
+++ b/doc/manuals/osmosmlc-usermanual.adoc
@@ -18,6 +18,10 @@
 
 include::./common/chapters/cs7-config.adoc[]
 
+include::{srcdir}/chapters/positioning.adoc[]
+
+include::{srcdir}/chapters/cells.adoc[]
+
 include::./common/chapters/counters-overview.adoc[]
 
 // include::{srcdir}/chapters/counters.adoc[]