diff --git a/docs.it4i/anselm/compute-nodes.md b/docs.it4i/anselm/compute-nodes.md
index 63d441e8564bf640d9e6201410120d3568b3f2c7..9e5ed7135a2b28fd5db29219992f930399c3787b 100644
--- a/docs.it4i/anselm/compute-nodes.md
+++ b/docs.it4i/anselm/compute-nodes.md
@@ -97,7 +97,11 @@ Intel Turbo Boost Technology is used by default,  you can disable it for all nod
 $ qsub -A OPEN-0-0 -q qprod -l select=4:ncpus=16 -l cpu_turbo_boost=0 -I
 ```
 
-## Compute Nodes Without Accelerators
+## Memmory Architecture
+
+The cluster contains three types of compute nodes.
+
+### Compute Nodes Without Accelerators
 
 * 2 sockets
 * Memory Controllers are integrated into processors.
@@ -107,7 +111,7 @@ $ qsub -A OPEN-0-0 -q qprod -l select=4:ncpus=16 -l cpu_turbo_boost=0 -I
   * Data rate support: up to 1600MT/s
 * Populated memory: 8 x 8 GB DDR3 DIMM 1600 MHz
 
-## Compute Nodes With a GPU or MIC Accelerator
+### Compute Nodes With a GPU or MIC Accelerator
 
 * 2 sockets
 * Memory Controllers are integrated into processors.
@@ -117,7 +121,7 @@ $ qsub -A OPEN-0-0 -q qprod -l select=4:ncpus=16 -l cpu_turbo_boost=0 -I
   * Data rate support: up to 1600MT/s
 * Populated memory: 6 x 16 GB DDR3 DIMM 1600 MHz
 
-## Fat Compute Nodes
+### Fat Compute Nodes
 
 * 2 sockets
 * Memory Controllers are integrated into processors.