document env var

1 files changed, 3 insertions, 0 deletions

diff --git a/docs/env_variables.md b/docs/env_variables.md
index 4c0d2db7..811c5658 100644
--- a/docs/env_variables.md
+++ b/docs/env_variables.md
@@ -262,6 +262,9 @@ checks or alter some of the more exotic semantics of the tool:
     the target. This must be equal or larger than the size the target was
     compiled with.
 
+  - Setting AFL_DISABLE_TRIM tells afl-fuzz to no trim test cases. This is
+    usually a bad idea!
+
   - Setting AFL_NO_AFFINITY disables attempts to bind to a specific CPU core
     on Linux systems. This slows things down, but lets you run more instances
     of afl-fuzz than would be prudent (if you really want to).