diff --git a/docs/src/concept_reference/fix_connection_flow.md b/docs/src/concept_reference/fix_connection_flow.md
index 8c8f05bd77..f4995e0920 100644
--- a/docs/src/concept_reference/fix_connection_flow.md
+++ b/docs/src/concept_reference/fix_connection_flow.md
@@ -1 +1,3 @@
-The [fix\_connection\_flow](@ref) parameter fixes the value of the [connection\_flow](@ref) variable.
+The [fix_connection_flow](@ref) parameter fixes the value of the [connection_flow](@ref) variable.
+
+> **Warning:** that this parameter should be set to 0 for history timeslices to avoid free energy in the model when using the [connection_flow_delay](@ref) parameter.