diff --git a/docs/software_requirements/condition_variables.sdoc b/docs/software_requirements/condition_variables.sdoc
new file mode 100644
index 0000000..0b7e249
--- /dev/null
+++ b/docs/software_requirements/condition_variables.sdoc
@@ -0,0 +1,97 @@
+[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 one 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: Release mutex on wait
+STATEMENT: >>>
+While waiting on a condition variable the thread shall release the current owned mutex.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
+
+[REQUIREMENT]
+UID: ZEP-SRS-21-7
+STATUS: Draft
+TYPE: Functional
+COMPONENT: Condition Variables
+TITLE: Unblock a waiting thread
+STATEMENT: >>>
+A waiting thread shall only be unblocked if a signal is sent to the condition variable.
+<<<
+RELATIONS:
+- TYPE: Parent
+  VALUE: ZEP-SYRS-20
diff --git a/docs/software_requirements/index.sdoc b/docs/software_requirements/index.sdoc
index 668701e..e200aa9 100644
--- a/docs/software_requirements/index.sdoc
+++ b/docs/software_requirements/index.sdoc
@@ -61,3 +61,6 @@ FILE: timers.sdoc
 
 [DOCUMENT_FROM_FILE]
 FILE: tracing.sdoc
+
+[DOCUMENT_FROM_FILE]
+FILE: condition_variables.sdoc