diff --git a/papers/doc/3-pattern/effects.md b/papers/doc/3-pattern/effects.md
index 0aa1fc03..9d784d38 100644
--- a/papers/doc/3-pattern/effects.md
+++ b/papers/doc/3-pattern/effects.md
@@ -57,9 +57,6 @@ however, effects are continuous, which means you only need to type it once and t
 - `EDxx`: delay note by `xx` ticks.
 - `EExx`: send external command.
   - this effect is currently incomplete.
-- `EFxx`: add or subtract global pitch.
-  - this effect is rather weird. use with caution.
-  - `80` is center.
 - `F0xx`: change song Hz by BPM value.
 - `F1xx`: single tick slide up.
 - `F2xx`: single tick slide down.
diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 50fbbadc..38185aaa 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -110,8 +110,6 @@ const char* DivEngine::getEffectDesc(unsigned char effect, int chan, bool notNul
       return "EDxx: Note delay";
     case 0xee:
       return "EExx: Send external command";
-    case 0xef:
-      return "EFxx: Set global tuning (quirky!)";
     case 0xf0:
       return "F0xx: Set tick rate (bpm)";
     case 0xf1: