diff --git a/src/finn/util/fpgadataflow.py b/src/finn/util/fpgadataflow.py
index 7a404cd53e0fcbc758a960fa2d31792fb6263a18..9a2708439c0fed1e25c0d955af21cd2e9e705446 100644
--- a/src/finn/util/fpgadataflow.py
+++ b/src/finn/util/fpgadataflow.py
@@ -103,6 +103,7 @@ def pyverilate_get_liveness_threshold_cycles():
 
 
 def is_fpgadataflow_node(node):
+    """Returns True if given node is fpgadataflow node. Otherwise False."""
     is_node = False
     if node is not None:
         if node.domain == "finn":