diff --git a/docs/software_requirements/condition_variables.sdoc b/docs/software_requirements/condition_variables.sdoc
new file mode 100644
index 0000000..50c1ba6
--- /dev/null
+++ b/docs/software_requirements/condition_variables.sdoc
@@ -0,0 +1,123 @@
+[DOCUMENT]
+TITLE: Condition Variables
+REQ_PREFIX: ZEP-SRS-21-
+
+[GRAMMAR]
+IMPORT_FROM_FILE: software_requirements.sgra
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-1
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Dynamic initialization of condition variables
+STATEMENT: >>>
+The Zephyr RTOS shall provide a mechanism to define and initialize a condition variable dynamically (at runtime).
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-2
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Static initialization of condition variables
+STATEMENT: >>>
+The Zephyr RTOS shall provide a mechanism to define and initialize a condition variable statically (at compile time).
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-3
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Signal one waiting thread
+STATEMENT: >>>
+The Zephyr RTOS shall provide a mechanism to signal the highest priorite waiting thread when a condition is met.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-4
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Signal multiple waiting threads
+STATEMENT: >>>
+The Zephyr RTOS shall provide a mechanism to signal all waiting threads when a condition is met.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-5
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Wait on a condition variable
+STATEMENT: >>>
+The Zephyr RTOS shall provide a mechanism for a thread to wait on a condition variable.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-6
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Wait timeout on a condition variable
+STATEMENT: >>>
+When waiting on a condition variable, the thread shall specify a timeout value.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-7
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Wait timeout occurence
+STATEMENT: >>>
+When a timeout occurs while waiting on a condition variable, the thread shall be unblocked and a timeout error shall be returned.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-8
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Release mutex on wait
+STATEMENT: >>>
+If a thread is waiting on a condition variable, the thread shall release the current owned mutex independently.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-9
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Unblock a waiting thread
+STATEMENT: >>>
+henever some thread signals a condition variable the Zephyr RTOS shall unblock the highest priority thread currently waiting for this condition variable.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
diff --git a/docs/software_requirements/index.sdoc b/docs/software_requirements/index.sdoc
index 9a47f5c..a39b666 100644
--- a/docs/software_requirements/index.sdoc
+++ b/docs/software_requirements/index.sdoc
@@ -66,3 +66,6 @@ FILE: timers.sdoc
 
 [DOCUMENT_FROM_FILE]
 FILE: tracing.sdoc
+
+[DOCUMENT_FROM_FILE]
+FILE: condition_variables.sdoc
diff --git a/docs/system_requirements/index.sdoc b/docs/system_requirements/index.sdoc
index da2443c..a73ccda 100644
--- a/docs/system_requirements/index.sdoc
+++ b/docs/system_requirements/index.sdoc
@@ -293,3 +293,18 @@ Zepyhr shall provide a framework mechanism for tracing low level system operatio
 USER_STORY: >>>
 As a Zephyr RTOS user, I want to be able to trace different OS operations.
 <<<
+
+[SECTION]
+TITLE: Condition Variables
+
+[REQUIREMENT]
+UID: ZEP-SYRS-21
+STATUS: Draft
+TYPE: Non-Functional
+COMPONENT: Condition Variables
+TITLE: Condition Variables
+STATEMENT: >>>
+The Zephyr RTOS shall provide a framework to synchronize threads based on a condition variable.
+<<<
+
+[/SECTION]