diff --git a/README.md b/README.md
index 895cd33..9a3ecae 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Textures: CC BY-SA 3.0
 The TA1 mill sound is from https://freesound.org/people/JustinBW/sounds/70200/
 The TA1 watermill sound is from https://freesound.org/people/bmoreno/sounds/164182/
 
-Many thanks to Thomas-S and others for their contributions
+Many thanks to Thomas-S, niklp09, and others for their contributions
 
 
 ### Dependencies  
@@ -88,6 +88,16 @@ Available worlds will be converted to 'lsqlite3', but there is no way back, so:
 
 ### History
 
+**2023-05-05 V1.15**
+
+- Allow energy storage with up to 13x13x13 concrete blocks
+- Allow registration of other buckets
+- Add hyperloop chest only if the hyperloop mod is available
+- Add missing 'minetest.formspec_escape' #131 
+- Fix bug "Trouble with flycontroller #130"    
+- Add optional dependency on farming mod (orwell96)
+- Fix forceload formspec receiver (Niklp09)
+
 **2023-04-16 V1.14**
 
 - Add file "api.md"
diff --git a/energy_storage/heatexchanger2.lua b/energy_storage/heatexchanger2.lua
index c295913..4aee1a9 100644
--- a/energy_storage/heatexchanger2.lua
+++ b/energy_storage/heatexchanger2.lua
@@ -30,7 +30,7 @@ local PWR_CAPA = {
 	[5] = GRVL_CAPA * 3 * 3 * 3,      -- 13500 Cyc = 450 min = 22.5 kud
 	[7] = GRVL_CAPA * 5 * 5 * 5,      -- 104 kud
 	[9] = GRVL_CAPA * 7 * 7 * 7,      -- 286 kuh
-	[11] = GRVL_CAPA * 9 * 9 * 9,     -- 607 kuh
+	[11] = GRVL_CAPA * 9 * 9 * 9,     -- 610 kuh
 	[13] = GRVL_CAPA * 11 * 11 * 11,  -- 1112 kuh
 }
 local DOWN = 5
diff --git a/init.lua b/init.lua
index 130fc28..21fdcfe 100644
--- a/init.lua
+++ b/init.lua
@@ -13,7 +13,7 @@
 techage = {}
 
 -- Version for compatibility checks, see readme.md/history
-techage.version = 1.14
+techage.version = 1.15
 
 if minetest.global_exists("tubelib") then
 	minetest.log("error", "[techage] Techage can't be used together with the mod tubelib!")