diff --git a/Push-buttons-and-button-caps.md b/Push-buttons-and-button-caps.md
index 40a4bc9..6b235f1 100644
--- a/Push-buttons-and-button-caps.md
+++ b/Push-buttons-and-button-caps.md
@@ -1,3 +1,4 @@
+# Push-buttons
 The type of push-buttons used on the Portapack is SMD tactile switches of 6 mm per side and 7 mm of height. You can buy replacements here: https://a.aliexpress.com/_dZqx4vv 
 
 The easiest way to remove them is to clip the legs off, clean the pads carefully with solder wick and solder the new buttons. 
@@ -8,3 +9,6 @@ You can also find replacement caps for the tactile switches: https://www.aliexpr
 
 Alternative caps for the switches: https://www.ebay.com/itm/284831256446
 
+# Encoder aka knob (H2/H2+)
+Use a 20 bit ec11 encoder.  
+It may have weird performances if you installed a 24 bit ec11.(Ref. https://discord.com/channels/719669764804444213/737376558754300081/951522295069962300)
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