diff --git a/lib_dec/jbm_jb4sb.c b/lib_dec/jbm_jb4sb.c
index 6e09e58e2b495e9fc3f09af1617717021dfe507a..8ea0e54d822e1b0c630a02336bf62450815d33f6 100644
--- a/lib_dec/jbm_jb4sb.c
+++ b/lib_dec/jbm_jb4sb.c
@@ -381,9 +381,11 @@ JB4_DATAUNIT_HANDLE JB4_AllocDataUnit(
         JB4_dropFromBuffer( h );
     }
 
+    /* LOCK JBM MEMORY SLOT BEGIN */
     --h->nFreeMemorySlots;
     dataUnit = h->freeMemorySlots[h->nFreeMemorySlots];
     h->freeMemorySlots[h->nFreeMemorySlots] = NULL;
+    /* LOCK JBM MEMORY SLOT END */
     assert( dataUnit != NULL );
 
     return dataUnit;
@@ -397,8 +399,10 @@ void JB4_FreeDataUnit(
 {
     assert( dataUnit != NULL );
     assert( h->nFreeMemorySlots < MAX_JBM_SLOTS );
+    /* LOCK JBM MEMORY SLOT BEGIN */
     h->freeMemorySlots[h->nFreeMemorySlots] = dataUnit;
     h->nFreeMemorySlots++;
+    /* LOCK JBM MEMORY SLOT END */
 
     return;
 }
diff --git a/readme.txt b/readme.txt
index cd5a01d4bed7837f7f29b9856d32858aba6d152b..e6fbd729ead207359e6e304a12d7ea5f9ff29388 100644
--- a/readme.txt
+++ b/readme.txt
@@ -150,6 +150,24 @@ executables are "IVAS_cod.exe", "IVAS_dec.exe", "IVAS_rend.exe", and
 "ISAR_post_rend.exe". All reside in the c-code main directory. 
 
 
+                       INTEGRATION AS LIBRARIES
+                       ========================
+
+While this package contains the necessary applications to execute the IVAS encoder,
+decoder, renderer and ISAR post renderer, it is envisioned that the libraries used
+would be integrated into custom applications.
+
+It should be noted that this library is not thread-safe by default. Thus, when using
+the IVAS libraries in a multi-threaded environment, proper synchronization of API
+calls is required to prevent race conditions by concurrent access to IVAS internal
+state memory, FIFO queues buffers or any other data structures. Potential mechanisms
+include e.g. mutexes, spinlocks and semaphores. The API calls are at the present not
+optimized for fine-granular locking of just critical sections. Some sensitive
+sections have thus been marked with a comment in the form /* LOCK XYZ BEGIN */ and
+/* LOCK XYZ END */ to provide guidance where code could be modified to prevent
+some potential race conditions.
+
+
                        RUNNING THE SOFTWARE
                        ====================