diff --git a/Resources/Prototypes/Entities/Structures/Piping/Atmospherics/trinary.yml b/Resources/Prototypes/Entities/Structures/Piping/Atmospherics/trinary.yml
index bde7136850..298afcc4b0 100644
--- a/Resources/Prototypes/Entities/Structures/Piping/Atmospherics/trinary.yml
+++ b/Resources/Prototypes/Entities/Structures/Piping/Atmospherics/trinary.yml
@@ -210,7 +210,7 @@
   parent: GasPipeBase
   id: PressureControlledValve
   name: pneumatic valve
-  description: Valve controlled by pressure.
+  description: A bidirectional valve controlled by pressure. Opens if the output pipe is lower than the pressure of the control pipe by 101.325 kPa.
   placement:
     mode: SnapgridCenter
   components:
diff --git a/Resources/Prototypes/Recipes/Construction/utilities.yml b/Resources/Prototypes/Recipes/Construction/utilities.yml
index 92bea76ffd..cecb249555 100644
--- a/Resources/Prototypes/Recipes/Construction/utilities.yml
+++ b/Resources/Prototypes/Recipes/Construction/utilities.yml
@@ -785,7 +785,7 @@
 - type: construction
   id: PressureControlledValve
   name: pneumatic valve
-  description: Valve controlled by pressure.
+  description: A bidirectional valve controlled by pressure. Opens if the output pipe is lower than the pressure of the control pipe by 101.325 kPa.
   graph: GasTrinary
   startNode: start
   targetNode: pneumaticvalve